Actually I'm not sure if I agree with that statement.
Should model 3 cause the demise of tesla, do you really believe GM would continue to build better Bolts and Nissan keeps at it with Leaf?
Why would they continue to invest big money for such a tiny market? Plus, big automakers could even lobby govt to relax rules in the future too...
For future EVs to really stick around, model 3 need to make it!