For a bit of a reality check, go take a look at Financial Times coverage of Tesla.
Tesla will require regular infusions of capital over, say, the next 5 years. The only source for that is more equity, and to do that you need to actually start meeting some of your self-declared profitability goals. Up to now, Tesla hasn't.
The tactic of diverting attention with "but look, here's this great awesome world-changing thing we'll do next" has worked so far but it's rapidly getting old. In general, the frequency with which sleights of hand are starting to be employed is concerning. Remember the "but don't just take my word on it — I myself will be buying $20M of new stock!" thing? Sure you will to reassure investors, given that loss of confidence will cost you personally far more than $20M.
SolarCity? "If Musk thought Tesla really needs a solar company, he might as well buy a good one. But it doesn't" [FT Lex]. Given how important it is that they are able to keep raising capital through equity offerings, taking the risk of freaking the investors out with SolarCity acquisition (otherwise expected to go into bankruptcy protection by next year) makes sense only if letting SC fail presents a bigger risk of the same. The Musk fairytale would certainly take a hit from a SC bankruptcy.
And Musk setting these crazy numbers goals practically guarantees he's setting TSLA shareholders up for disappointment.
Non-profit-making Amazon has been raised as a counterargument in the comments on this thread; the amount of trust the market has extended to Bezos for the time that it has is practically unprecedented; and Bezos has worked hard to make that happen by making investment/direction choices & providing information to earn the trust of the market. Musk, to the contrary, is doing everything to the opposite.
Now, what's the likelihood of a macro downturn within the next 2-5 years? Massive. That might trip up the availability of capital a bit—those refundable $1000 deposits too but who cares about them (by the way, much of T's capital has been raised during the period of literally historically unprecedented low cost of capital)
I didn't even begin to talk about competition. Or that Panasonic, T's critical gigafactory partner, isn't just sitting around twiddling thumbs (or the Chinese).
So, it'd be prudent to curb your enthusiasm. There might not be a part trois.