I don't think Twitter is automatically doomed, but I think there are more things to consider than just Musk's "track record of successes". And one of the important things is that he doesn't look like he actually understands Twitter. He keeps calling it a "software and servers company", keeps talking about "hardcore coding", alienating and angering users and advertisers... People would be be more confident in his abilities if he actually looked humble enough to recognize the parts where his expertise is lacking.