For Mission E to be competitive in price, it means all Panameras must drop massively in price since the Mission E will be superior, newer, and higher performance.

And that's just the Model S. If it happens with the S, no reason to think it wouldn't happen with the X/Cayenne/Macan etc.

As I said, the only way for Porsche to be price competitive is by taking all their prices down massively and their profits with them. The alternative is just that the Mission E etc won't be very successful for quite a while and Tesla sales will be fine.