The theory how to scale up car production is well known, and the established players like Toyota are already masters at that (lean and just-in-time manufacturing were after all invented at Toyota). It's Tesla who's having issues with scaling up production[1].

We're in the middle of a turning point in the car industry. I'd wager in 2-3 years sales of electric cars will already be a sizeable chunk of the market. Within about a decade electric personal cars will take over sales of petrol cars. But nothing suggests that VW, Toyota etc. would not be any less apt at producing electric cars than Tesla. On the contrary, the established players have a MASSIVELY superior pre-existing production capacity and expertise.

[1]: https://www.reuters.com/article/us-tesla-batteryday-producti...