It's interesting to compare Swift 2 -> 3 to the Python 2 -> 3 upgrade experience. Apple will simply break whatever they need to break to get the improvements they decide would be valuable, move on, and anyone who doesn't follow is likely to be left in the dust.

Frankly, I welcome it after years of feeling like the only Python 3 user on Earth.

For the next few years, I expect Apple will wield a great deal more power over the Swift user community than the Benevolent Dictator For Life has wielded over his supposed minions. I hope we'll get a better language this way, and that these changes won't simply break third-party products to make changes that mostly benefit Apple.

Rich, powerful giant gives power to fork to the little people. Will it be like C#? Like Java? Eventually like Python? Should be interesting....