I think one possible route is that cloud capacity just becomes totally commoditized and none of the hyperscalers will be able to extract the kinds of profit margins that would allow them to make a good return on their investment (model makers will fall victim to this too). Ultimately, what may happen is that market competition for everything explodes since AI and robots can do all the work, prices for everything (goods, services, assets) collapses, and no one is really any richer than anyone else.
The magical thing about software is that efficiency gains can come pretty quickly relative to other industries.
Cisco was a bubble in the dot com crash, despite being a company that provide real value and profit, just not at the level of the crazy expectations from the time.
The public hasn't seen the insane ROA/ROI on GPUs. So all AI adjacent stocks are massively undervalued.