guesses:

• Tesla craters because his ability to bullshit investors is the only thing keeping that stock supported. Possible short term bump if the nazi liability is seen as being cleansed from the brand by his death
• SpaceX improves because he stops interfering with his own stupid decisions
• Twitter gets sold off, winding up with whichever billionaire bids the most for it. somebody backed by Blackrock or another huge capital faction
• who gives a fuck about The Boring Company