Sciences, sports, politics, news and many more all rely on twitter as a platform that works or used to. There really is a case for a internationally ran system for this. Twitter has such a high value that removing it will have a negative impact. Something that has become so fundamental to getting a message across needs to be ran in a not for profit fashion, rather than see it go to the wall because there is not enough return in it.
Nope but the general use is going to be overwhelmed by the idea of instances.
I'm a techie and I had to spend a good amount of time reading about how it all works before I felt comfortable joining here. So the average user would probably just give up and use something else.
The email comparison is definitely the best one I've seen so far but I still don't think it'll stick with people.
Mastodon isn't ready yet but it could be. Honestly, Lemmy still needs time to develop too.
It's early days and we should be open to new ways of doing things. Dogmatically sticking with the initial idea of what these platforms look like will only ensure their demise.
Personally, I think that accounts and communities on the Fediverse should just be federated. That way, platforms like Lemmy essentially act as a p2p network. No more needing to pick a server, no concern over having someone steal your username on another instance, and no more overcrowding on popular instances. You can just get put on a server that has space for you (or run your own), and control what you see and don't see without.