There are already alternatives to Twitter. Why haven't you ditched it already?
For a real alternative to succeed, solid backers focused on dethroning tw are needed to inspire confidence and stability, then we all need to jump at about the same time to get the momentum going and bounce out of the twatterverse.
As it stands now, there is no real competition.
That's exactly the point - there is no reason to believe this would change if Musk created his own social network.
Most rejected the overall concept. The amt of users that stil want something similar but not Twitter AND who will be appeased by whatever alt Twitter is made is an even smaller number.