The only issue is that Musk vastly overpaid for Twitter, but if he plans to keep it and use it for his political ambitions, that might not matter. Also remember that while many agree that $44B was a bit much, most did still put Twitter at 10s of billions, not the $500M I think you could justify.
The firings, which was going to tank Twitter also turned out reasonably well. Turns out they didn't need all those people.
1. He overpaid by tens of billions. That is a phenomenal amount of money to lose on an unforced error.
2. Enough users, who produce enough content, have left to make X increasingly a forum for porn bots, scam accounts and political activists. It's losing its appeal as the place "where the news happens" and is instead becoming more niche.
3. The firings did not go well. X has struggled to ship new features and appears nowhere closer to the "everything app" Musk promised. It posts strange UUID error codes. The remaining developers seem to implement things primarily client side, to the extent I even wonder if they have lost their ability to safely roll out backend changes.
4. The capture of X by far-right agitators has led to long term brand damage for Tesla, Musk's most important business property.
I can't see any positive outcome from it.
I did not use Twitter. I do not use X. I'm even less inclined to become a user after the Musk takeover. I don't even know anyone who is active on X. However, I still constantly get linked to tweets and see screenshots of tweets (or whatever they're called now). And I never see anything from competing platforms.
X may be failing by many metrics, but in terms of popularity it is still the undisputed king of its market. It's by no means "niche".