Oh, just the usual near-monthly (if not daily) death march of ever-increasing version numbers, just like Chrome and Firefox. And Windows Update. And OS X, And iOS. And Ubuntu. And so on, and so on, and so on...
I'm how sure how I feel about it with the JRE. I have old open source apps on Scala 2.11/SBT 0.13 that are already experience dependency rot. :-/ It's going to be more difficult too since deprecated stuff is finally getting removed from Java.
I'm curious to see where we'll be a few years from now.