Abolition of the Leap Second is basically a done deal. So, the differences caused by leap seconds will become frozen as arbitrary offsets, GPS time versus UTC for example.
Basically when it was invented leap seconds seemed like a good idea because we assumed the inconvenience versus value was a good trade, but in practice we've discovered the value is negligible and the inconvenience more than we expected, so, bye bye leap seconds.
The body responsible has formal treaty promises to make UTC track the Earth's spin and replacing those treaties is a huge pain, so, the "hack" proposed is to imagine into existence a leap minute or even a leap hour that could correct for the spin, and then in practice those will never be used either because it's even less convenient than a leap second - but by the time they're asked to set a date for these hypothetical changes likely the signatory countries won't exist and their successors can just sign a revised treaty, countries only tend to last a few hundred years, look at the poor US which is preparing 250th anniversary celebrations while also approaching civil war.
I tried to think about and leap seconds on their own don't seem to be a real problem. The problem is that leap seconds, minutes, hours, days, years, etc are a human interface concept and therefore only make sense to humans, but we've decided to force machines to deal with these human interface concepts as the primary way of dealing with time, when only the presentation layer should even know what a leap second is.
Leap seconds are not a human interface concept. Humans don't care. People who haven't thought very hard about this tend to believe humans care but they don't.
If humans cared the existing systems couldn't exist. For more than a century we've all lived with time "zones" which are thousands of seconds wide and we're not bothered by that. Many of us have civil time systems which shift twice per year by 3600 seconds for really no good reason, and while that's annoying it's barely worth a brief mention on TV news or in small talk. Leap seconds are 3600 times smaller and happen way less often, they're entirely negligible.
They existed because we thought we cared, and we actually don't care, and we thought it was pretty easy to do, and it actually wasn't very easy after all.
The October Revolution being in November is because of a different drift problem. The Calendar drifts because the Earth's orbit isn't a whole number of days, so any attempt to have fixed length years drifts noticeably over just a few decades, the initial fix ("Julian" calendars) had the compensation factor wrong, and countries adopted an improved calendar ("Gregorian" calendars) at different points leading to that offset between Old and New dates.
The leap second is because the Earth's spin varies. The orbit isn't varying significantly, it's just not a whole number of day-night cycles which is inconvenient for us, but the spin actually varies. To "fix" this variation we have leap seconds. But unlike the very noticeable October versus November difference, a century of missed leap seconds adds up to much less than a minute of difference between solar time and civil time, and that's not something you'll actually notice.
I'm aware of the different periods involved (I have a degree in astronomy), my point is that because the Russian Empire put off the switch for so long the difference became a historical joke. Similarly, I would suggest that it is generally best practice to make small changes quickly rather than large changes slowly. So why is it in the case of leap seconds (given we can and do perform measurements below the second scale to take account in variations in local and global gravity) are we seemingly unable to handle something so trivial?
But it isn't trivial, as I explained the leap days inserted to fix the calendar are entirely predictable. In 1752 when my country adopted this system they already knew that 1800 and 1900 would not have such a day but 2000 would. They had no idea what the year 2000 would be like but their calendar already told them it has an extra day.
In contrast leap seconds are not predictable because they're trying to smooth out spin variation and the planet's spin is affected by natural processes. The IERS measures UT1 and we add (or remove) leap seconds to make UTC try to approximate UT1, we get a few months warning at most that a new insertion or removal is needed.
And despite being very difficult all of this is also pointless because we don't care. As an astronomer you know you don't try to use a wristwatch to figure out the Earth's rotation, you can just look that up online and use your exact position. But for any other purpose except astronomy we don't need this angle information, we want a nice regular time and the atomic time, TAI, already provides that without this nonsense about leap seconds.
Basically when it was invented leap seconds seemed like a good idea because we assumed the inconvenience versus value was a good trade, but in practice we've discovered the value is negligible and the inconvenience more than we expected, so, bye bye leap seconds.
The body responsible has formal treaty promises to make UTC track the Earth's spin and replacing those treaties is a huge pain, so, the "hack" proposed is to imagine into existence a leap minute or even a leap hour that could correct for the spin, and then in practice those will never be used either because it's even less convenient than a leap second - but by the time they're asked to set a date for these hypothetical changes likely the signatory countries won't exist and their successors can just sign a revised treaty, countries only tend to last a few hundred years, look at the poor US which is preparing 250th anniversary celebrations while also approaching civil war.