Future growth is already baked into Tesla's current valuation of 60B. They're not making any money today (in fact they're losing billions) but they have a high market cap because they might become profitable years from now. Once (if) they become a mature car manufacturer their valuation multiple will go way down. They'll be judged on their profit margin and FCF like any other car manufacturer.
Your best case scenario of Tesla growing their market cap by 550B in the next 2 years is completely unrealistic. Even Facebook didn't grow that quickly, and their profit margin is second to none.