I think the prop up will be massive government funding of battery factories, and massive loans to keep them going through the fall of the ICE business until the EV business is ramped up enough to put the company on its own feet again.
I see this very likely to play out in Japan and Germany (not necessarily for all players, but, the heavy hitters), and then, by pointing to Germany and Japan to counter public frustration, be used in the US to do the same for GM and Ford.
It's looked like this to me for months now. fwiw, it has been clear to me for years that not only would the ICE incumbents basically not put out vehicles competitive to Tesla, they basically would not even try (see link below).
The likelihood of the German and Japanese governments putting up a huge part of the funding for 11th hour battery factories, and backstopping domestic ICE mfgs balance sheets is the moral hazard that is the last huge incentive to the behavior we've seen play out,
The Fractured Tipping Point Moat