I can't predict what Musk will do, but I'm under the distinct impression he's trying to allow free speech for everybody, get rid of bots, improve the tech (allow editing a tweet), and potentially hold people to account better by not allowing (or deranking) anonymous accounts. There's also leaked chat with Jack Dorsey about making an open interoperable protocol. Twitter would not die if it opened it's protocol and federated. As a public company that would destroy the ability to profit, but as a private company he can do that.
I have a lot of faith in Elon based on past results. He already solved the problem of people who don't believe in climate change - he got them to buy electric cars because they are sexy. Brilliant man.
Wow that's a grim perspective. Somehow I doubt that catering to the consumerism that got us to where we are with climate change is what's going to help us fix it.
That said, I think he is buying Twitter for the lulz / weird libertarian reasons, rather than making a real business out of it, and I have serious concerns it will injure what is currently a public utility absolutely beyond repair.