Close it Down and Get Out Quick
At least, that's what I'd advise, if I gave a damn about the guy.
If he does bail out, that's going to cost him north of $44billion in total, but right now it's the only rational thing to do. He's holding a nearly valueless asset (made valueless by his ownership) that is going to cost $1billion a year in finance costs plus all its operating costs (I'm assuming the ad revenue collapses). And that's without actually paying off any debt. He's already had to sell more Tesla stock, and at some point he's going to run out of Tesla shares to sell. Plus, every minute Twitter is run like this risks large regulatory fines which will further suppress ad revenue.
If he wants to get out of this still owning a substantial portion of Tesla and for that to still be worth a lot of money, he needs to get out whilst the Tesla share price can still support such an exit. If he gets out now, for only $50billion, he will be fortunate. If the Tesla share prices takes a major slide, I think he could end up personally bankrupt.
This is Going to Hurt People
And it already is. There's former employees on a visa whose lives are about to be massively altered by being thrown out of the USA. There's a pensions scheme - I don't know of its structure or arrangements - but there's people with pension money stacked up that's possibly at risk. If the company totally collapses, there's a bunch more employees who'll be looking for a job.
This Could Damage SpaceX and Tesla
Who'd want to go work for a Musk-run company now?
US Gov
Twitter is a vector for social influence, and it will be exploited by those opposed to US democracy. He's just made that easier to accomplish, though he's also reduced its impact (so many people a quitting Twitter).
Also, so far Uncle Sam is a customer of SpaceX, but has no stake in it or real control over it. Falcon 9 is now quite important to the US government, and geopolitically there's quite a lot riding on Super Heavy / StarShip being successful. There's probably a fair few geopolitical types in the US government who'd far rather that SpaceX was more traditionally aligned with the US's military-industrial complex's norms (apart from price), and less susceptible to the whims of someone who obviously doesn't like being beholden to the federal government, and is also a foreign national.
It's possible he's over-annoyed the federal government, and has made himself something of a target. He's definitely annoyed the FAA by routinely and regularly insulting them, he's annoyed the SEC by so blatantly ignoring the rules of business and insulting them. The federal gov will play things by the book, but there may be those whom are reading the book very carefully, and totting up the opportunities opened up by Musk, his behaviour, and the situations he's pushed himself into.
You don't prod sleeping tigers with a stick for the fun of it...