Is there some reason to believe auto makers will be totally unable to shift to EV? Particularly when most of them already have EVs? I also checked the stats, and it doesn't seem like the market cap of other auto makers have dropped because of Tesla. They're all over the map but generally trending positive, going back 12 years, which as far back as this site lets me go.
I agree they aren't selling a lot of EVs...but I also think a lot of that is just that EV demand is just not that high outside of certain bubbles, and certainly not at the current price point. Teslas, even Model 3s, are priced as luxury cars (I can't afford one myself), and have cachet among a certain set. Most EVs are worse off, in that they don't have the Tesla glamour. But there's no reason I can imagine that situation is permanent.
When/if demand changes due to regulation or economics or evolving tech, it's going to be a very different environment. This is particularly true as batteries become commodities. I don't want to handwave away the engineering, but electric motors are not revolutionary technology.
Even if we assume Tesla comes out on top, it seems crazy to believe Tesla is going to come out on top so hard that it sells 95% of all new vehicles globally.
NB: I think the auto industry future is very bleak for other reasons: we could make a great, reliable electric vehicle, but instead we're packing them full of shoddy electronics and software that will have unpredictable and difficult-to-troubleshoot failure modes (as is already the trend in ICE cars, where electronics are a bigger and bigger problem.) They will end up having to be serviced by manufacturers only and we'll probably all be cursed with subscription plans. Life will me much harder for those less well off.