Sounds like a two pronged question. Will EVs dominate auto sales? And will Tesla dominate the EV market.
Tesla is priced as if it's going to absolutely dominate the automotive market. And there's no reason to believe that's true.
Automotive is currently a super fragmented market with many players, why will that change in a couple decades when it has been true for the past century or so?
There will be at least 3-4 major players in NA just as there are now, maybe more.