I don't the envisioned scenario is that a data centre company fails and Nvidia starts making RTX 5090s for consumers. Rather, one of these companies fails, their stock of enterprise GPUs gets flooded on the market, and suddenly the people/companies buying RTX 5090s for local inference can buy full fat enterprise GPUs, shifting demand.
If a neocloud fails, it makes more sense to recapitalize it and leave the GPUs in place. If you sell the GPUs nobody will have enough power to run them.
If by enterprise you mean datacenter (which is what CoreWeave is), the "full fat" cards aren't as plug-and-play in a desktop PC as the consumer cards. They don't typically come with fans, and are meant to be cooled using some kind of holistic whole-rack (or larger) setup. Hobbyists do sometimes buy datacenter GPUs secondhand (and I have considered it, for the price/performance ratio) but it's kind of a lot of work and they tend to run hot.