They can't and they shouldn't. Tesla has a solid business. It just looks like it may have capped out its growth prospects in the U.S. and Europe. (In vehicles.)
Tesla is certainly a solid memestock. It’s hard to say whether they have a solid business. If they dumped Musk, the stock would crash and they would have to install competent governance instead of continuously gaming the system. But that would be a better outcome for consumers.
They have a solid business. It's just not the world-changing fantastic future that Musk talks a big game about. That's fine. But "solid business" is not what has manufactured Tesla's ridiculous market cap.
If Tesla's valuation reflected its value as a regular car company like, say, Toyota, it would be vastly lower. Shareholders would lose oodles of money.