Specific kinds of regulations might kill it as well - though most regulations probably validate it, there could be certain things that make it impossible to survive. Maybe some kind of regulation regarding asset size + value certification, or something about the security of the BTC numbers. Or possibly something about disclosure - since BTC allows you to keep 10 Billion in your drawer at home ... it creates a problem similar to offshore financing.
Musk was maybe smart to buy BTC because he's the kind of guy who can give it hype and 'cred' ... but either 1) he doesn't realize what it actually is and is unknowingly pushing Ponzi or 2) he knows what he's doing and happy to take money from dupes and rubes. I suggest it's the former, as everything Musk says leads me to believe he has never opened a finance text. The paradoxes of great leader: their giant blind spots outside the realms of their interest. Gates, Musk, Jobs, Bezos, Soros ... they can be big visionary in some areas and insufferable fools in others.