When it eventually does, they'll just come up with something else. Nvidia got a taste of inflated prices from the Crypto and then AI, and they're not going to just let that go. If nothing exists they'll make something and hype it endlessly to try to keep this going.
Unlikely. Unless some new technology comes around that completely invalidates existing GPUs and Nvidia cannot pivot to it quickly enough, there's just no way. They're too big, too rich, too powerful. They basically own the dedicated GPU market, with AMD holding maybe a piddly 10% at best.
Once the bubble pops, there will be a recession, lots of regular people will lose their jobs and won't be able to afford anything even IF prices come down.
I really hope this bubble pops, all these investors lose their shirts, and prices come down to something reasonable.