His purchase of Twitter was explicitly to take it private. He would look like a pretty humongous moron to just take it public again. And I seriously doubt Wall St would ever mindless lap up a super app with no users. It makes no sense. It's a ten-year old, mature company that was already public-traded. He can't just take it private, make it a whole new company, rebuild the user base from scratch then expect it to be worth more than he paid. He should have just bootstrapped a new company from zero if that was the intent.