Yes, because going from being the world's richest person to bankrupt wouldn't make a difference in anyone's life..
Yep. If he has to cough up a lot of the money, liquid, for the Twitter deal, he will have to cash out so much stock, it would drive Tesla's stock really far down and honestly to keep most of the big stockholders to stay in and stabilize the price at some point, he'd have to resign as CEO because none of them would see him as a capable leader anymore. Only his retail fanboys would but not the big guys in the market. His ego probably wouldn't let him do that as we know he is a massive egotistical maniac.
He will still be rich but oh would it make a huge difference in his life, his mental state and his finances.
The main thing that can save him now is a government swooping in and helping him finance the Twitter deal, and it will be a government not friendly to the interests of the United States because they see that his snowflake white male fragility and quasi-libertarian stances would be great to help fuck up this country. He can be just as divisive as Trump, just looked at as smarter. Just because he has some engineering chops, and used to be a good salesman, but now people are seeing the snake oil, and he is terrible at everything else.