I didn't say they couldn't be resold, they simply won't have as wide a potential user market like an generic GPU would. But think about it for a sec, you've got thousands of AI dedicated gpu's going stale whenever a datacenter gets overhauled or a datacenter goes bust.
that's gonna put a lot more product on the market that other datacenters aren't going to touch - no one puts used hardware in their racks - so who's gonna gobble up all this stuff?
not the gamers. who else needs this kind of stuff?