The best argument for grabbing a 5080 right now, if you can find one at $999 in the first place, is that the only cards that come close to its performance are either way more expensive than they're supposed to be (the 4080 Super) or not cheap enough to justify the Nvidia-specific features you give up (AMD's Radeon 7900 XTX).

Although we know the MSRP of the Nvidia RTX 5080, the cards made by Nvidia's partners are going to cost a whole lot more.