Tesla will certainly lose market share as these new entrants arrive. However, the EV market is expanding so rapidly that its absolute production numbers will probably continue to climb.
At least where I live, I have been surprised by two things in the past few months, especially with the arrival of the seasonal "snow birds". Cars such as the Mustang Mach-E and VW ID.4 remain scarce as hens' teeth on the roads even though they are on dealers' lots. But the roads and intersections are crawling with Teslas (mostly 3's and Y's, and predominantly white ones). We have counted as many as seven sitting through a stoplight at one large intersection. Besides our own Plaid, we have seen Plaids in every color except blue on the roads or in parking lots. We almost never take a local trip of more than a few minutes without seeing a Tesla. The Service Center in the next town up is delivering more than 800 cars a quarter and climbing at last count.