Even if you are right with everything you predicted (some of it, all of it is doubtfull), that does not negate the core competencies of traditional car makers.
You still need someone to buold cars -> existing car makers
EVs are actually easier to built than EVs -> inceeasing the advantage they have on production
Maintenance -> to be done locally, there is no way to centralize it on a full continent, car makers and their existing network are king
Fleet management -> see above, plus existing fleet mgt serives, only real competition are large rental car companies
Ride sharing -> acquisitions, mytaxi in the case of Mercendes, drivenow and car2go in the case of Mercedes and BMW, VW with an in-house solution
Self-driving -> acquisition of the provider (GM and Cruise) or sourcing the tech, alternative is a partnership (Jaguar)
Traditional car makers slept into these developments, a few years ago I would have bet a lot on disruptors in that industry. Now that changed, the only "tech" (as in software) companies that can compete are the likes of Google and maybe Uber as long as VC money doesn't run out. The same is true for certain smaller manufacturers of automobiles, but this market cleaning is gling on for while now so they are used to it. And let's fave it, the automotive sector is well entrenched in politics (Europe, Japan and the US, Chine, too) and money generally is not a rwal problem. So, yeah, now I would say Google / Wymo might become a major Tier one supplier. But hardly more.