That's quite some wishful thinking here. EV competition is loosing money anyway on their EV cars, but it's funded by their much bigger traditional ICE vehicles business anyway. So yes, it may hurt them more on that part of the business, but this part is rather small for them.

In other countries that killed subsides for EVs, sales plummeted. And the incentives where much lower than in the US.

EDIT: Forgot to add - Tesla is not making a lot of money on their cars btw. If they are forced to cut prices even a tiny bit to keep the sales, it will wipe out most of the margin they have. Put another way, if all subsides for EVs on federal and state level go away (which is not currently planned of course), Tesla is out of business within 2 years.