Whoopsy:

And which is what I had been saying. The people that have Tesla right now are don't have a choice for a nicer car, they had to get it. Now that Porsche is in the game, of course they will jump ship. Well until say Rolls Royce make a EV, then a bunch will jump again.

Of course there are some existing Tesla owners curious to purchase a Taycan. Several of those people probably keep the Tesla and add a Taycan to the stable. 

What you forget is that Tesla is pumping out 100k S and X per year. Porsche plan to produce 20-30k the first year and now some North American boss is saying that several of the reservation holders are Tesla owners. So, let's say that they have 5-10k reservations from Tesla owners. Do you think that is many based on how many X and S on the road?

Just like when the Prius first arrived. People don't have a choice, now there are many many much better hybrid cars.

The Taycan do not eat into Panamera sales, they are completely different cars, one's EV, one's not. Taycan only eats into the EV market. Well that market will grow too, bit the initial bite will be big against Tesla simply because of the existing demand. But eventually it will stabilize and Tesla's sales will grow again, but so is everyone else's, and at that time, it will be based on whoever make the best product, or the best value, or the best prestige. Monopoly no more.

The Taycan WILL eat into Panamera and all other ICE sales in the same price bracket. Thing is that there are so many existing or presumptive Porsche owners who are clueless and will today say that they want a Panamera and hence is not among the first batch of reservation holders. When the Taycan is available at the dealerships for a test drive I'm certain that many of those Panamera customers will change their mind... And probably some 911 and Cayenne customers as well...