Well however unlikely lets say there's some sort of great progress (perhaps dare I even say the playoffs) in 2019 led by youngins and the the top 2 players have injuries sort of like a Simmons/Embiid in 2020.. I think thats probably the only plausible scenario he stays on.
There's always the next KD.. (2023)
The year after him is Bron's son and there's this Canadian kid Elijah Fisher who's like 6'4" and has been dunking for a while now. (I don't pay much attention to these younger players, I'll always take a look at some potential phenom tho. Friend of mine's son is the top ranked player in California for this age group)
This kid appears to be on the fast-track to the lottery, sorta T-Mac ish, he's already taller tho.
Sadly, High-major colleges are in fact monitoring these younger players for sure. I have a friend who's an AAU coach here in NY.. I stay well versed in the HS aged kids tho, and even check in on the international phenoms, I like to catch these type of stories early.
For a potential bottom-feeding team there's gonna be a lot of low-hanging fruit to be plucked in the coming years. The depth of 2017 is phenomenal and the PG crop is the best, there's gonna be some game-changers on the way for sure. None are quite like Marvin Bagley III tho, that kid is probably the best big I've ever seen at the same stage (and has been that for years)