The companies displaying display screens at any given automotive show, would not be Tesla competitors. They would be the display parts manufacturers. The point was that display parts guys have been trying to up sell auto makers for years. So the larger screens would have, and did, exist in any case. It's just that no one was buying. Too expensive.

But yeah, with or without Tesla, obviously the screens would have existed.

Yes, but this is the point - they stick to ugly looking touchscreens that are guaranteed to work. They could take screens from some tablet for few bucks, but they know that when they sell 100000 of cars and 20% would fail within two years it would cost them a lot to fix within warranty. If they start to fail after warranty, it would be huge impact on their good will and resale value on those cars would be damaged.