Most of my thoughts have already been covered:
* Changes should be announced in advance, and preferably a forum discussion as well to come up with additional tweaks to the idea that might not have been thought of.
* If it's going for realism then it's a miss. On the NBA stats page it says there are twelve age 34 players, and it's fair to say none of them are close to their peak. Guys like Draymond, Harden, Butler, Klay, PG are already declining. When you look at NBA players above 34, only about 6/33 are still solid, the rest are barely playable. And that's players still in the league, there will be dozens no longer good enough who are playing abroad or retired.
* Ignoring realism - primes in BB do feel short, so I don't mind finding a way of extending it. But perhaps there was a better way, for example having a slower decline from age 34 onwards. We'll see how it plays out.