Elon Musk announced the entire codebase of X/Twitter will be going open source
(media.thebrainbin.org)
I do think that people will probably get used to that aspect of the fediverse.
About the twitter bridge, I see your point. It wouldn't be twitter anymore though, it would be the [federated fork name] of twitter which would have to co-opt the current userbase which kind of again leads to the whole why not Mastodon already instead?