I am a fan of the company and think they can change the face of transportation. Because of this I am an investor.
In another 9.5 years I hope to post my story for the haters back here: viewtopic.php?f=10&t=106653
Quite frankly, you are mad.
Electric cars, or rather zero emission at the tailpipe cars, are the wave of the future. Come they will. (cue a long argument about what 'zero emission' means-- I am not going to have that here, it's outside Forum rules and it's counterproductive in any case).
My own bet is that what EVs will excel at is being 'second vehicles'. A series of rent by the hour machines parked on urban streetcorners, that zip us around nicely for all those sub 15 mile journeys that we do. (turn it around, logically that should be our first car, and the second car ie the highway cruiser, is the one we rent when we need to). So dense packed cities like New York, London, Tokyo, Shanghai, Paris etc.
What an EV is is disruptive. It changes our notion of what a car is, and how we use it. There's little or no mileage in simply making an expensive version of an existing car (although that's a necessary step on the road).
A very high end sports car? Not likely. That's a 'proof of concept' vehicle however you slice it. EVs aren't a success until one can, like the Prius, turn to a volume car and say '1 million sold'.
Betting anything other than 'play money' that Tesla will either be the company that makes that car OR get bought by one of the big boys for its brand/ technology seems to me a real long shot, with any number of things that will and can go wrong-- think Delorean, or Bricklin.
Think of all the early PC manufacturers that are gone: Atari, Commodore, Southwest Technical Products, Altair.