Twitter would be lucky to be trading at $20 / share minus the supporting bid. Musk overpaid by a minimum of $15 billion because he doesn't properly control his impulse problems. There were numerous ways he could have proceeded more slowly in pursuing a purchase, without so tightly locking himself into that grotesque price tag.
Let's put his stupidity into perspective: $15 billion was his total net worth five years ago. It was half his net worth a bit over two years ago.
Next up, Tesla's stock is going to sink considerably from where it's at. It'll just amplify the pain of this over-pay.