Which might be fixable with ART as it's an on-device ahead-of-time compiler (I think it optimizes too? can't find references...). I have no idea if it actually does work for this in practice or not, though.
Well sure. But people don't update their Java installs either, neither do all businesses. They're likely not going to be able to take advantage of v8 stuff. And can dumbphones on a Java platform (Symbian? Nokia? Others?) run the new Java flashiness? Every platform has problems like this.