Grrrrr i personally hate this darwinistic way of dealing with people 'if you cant door deal with it, then get out'... this is not like trying to get into the NFL, he should have taken a nicer approach, in fact as a teachet he should have been able to predict this well in advance and shown his students how to transition to other technologies
True, "if you can't deal with it..." approach is rude. But it's the truth. And Tom did explain the situation in detail to the students as he wrote in his post. It wasn't like STFU or leave.