The amount of users who care about Mastodon is negligible when compared with the amount of Twitter users. People have already voted and Mastodon got the thumbs down.
That's maybe the sentiment of the users, but the implementation details allow indexing of public content very easily.
Anyway, the purpose - at least in my eyes - is not to compete with twitter as a whole, but to offer alternatives to people that desire it. And to this end, I think Mastodon, and I hope the rest of the fediverse proved quite successful.
The market isn't an election with a fixed end date. Twitter didn't even exist 20 years ago, it's not going to last forever.