> I suppose they could force him into bankruptcy which would end up with his ownership stakes in Tesla and SpaceX sold off.
I don't think they'd need to force him into bankruptcy. If a judge awards Twitter (say) $10 billion in damages, there are many avenues to seize enough of Musk's assets to pay without making him bankrupt.
Well the best case for Twitter isn't $10bn in damages, it's forcing him to go through with the the entire original $44bn deal.
Elon's net worth has already fallen by $65bn in the past few months - I'd imagine the valuation of his assets will fall quite a lot more once it becomes known he's going to have to offload $44bn worth of Tesla and/or SpaceX to finance a bad deal.
Elon won't be bankrupt in the colloquial sense of financially ruined, but if he's forced to go through with deal and is unable to finance it he will have to liquidate an enormous amount of assets - and many of his assets are already collateral for existing loans.
I don't think they'd need to force him into bankruptcy. If a judge awards Twitter (say) $10 billion in damages, there are many avenues to seize enough of Musk's assets to pay without making him bankrupt.