Anyone who legitimately thinks Twitter will die is deluded or huffing copium. Elon has temporarily throttled Twitter because he hasn't paid for server space, and will unthrottle it once he's sorted it out. Elon has a history of making businesses work, and even if he doesn't manage to get Twitter to make money, I think Elon sees the value of having a prominent social media platform owned and operated by him, to the extent that he would subsidize it's operating costs with his profits from Tesla if required.