Nikola went public this month and already has a market cap over $20 billion, though it hasn't made any production vehicles. According TheStreet, some experts are skeptical about the company's future, such as Jim Cramer. Sound familiar?

Experts, including Cramer, have been skeptical about Tesla since the beginning. While Cramer and many others have recently changed their tune, there are plenty of people still counting on Tesla's failure. However, while Tesla has many products that have yet to come to market, it has proven for years that it can successfully produce and sell vehicles.