What you say is very true, but we are talking about Porsche here, the maker of the 911.

For that very reason, Tesla should keep their eyes on them and the buying public should take note whenever Porche's electric offering hits the market.

The upshot is that Tesla will not have this market to themselves forever. So that's probably bad for TSLA shareholders and good for the low emission* car buying public.

The gigafactory is probably a direct response to the their knowledge that they won't have the high performance electric car market to themselves forever.

* assuming your electricity is not generate by a coal fired plant.