Before Gmail's groundbreaking 1GB limit, you had offerings like 15mb or 100mb from yahoo or hotmail. What that meant for your day to day experience would be that you would literally run out of space and then have to manually comb through your inbox to delete things you don't want. And if you wanted stuff, you had to harshly prioritize between treasured message threads.
These are all part of the UX
Also is there room in this utopia for people who want their privacy and secrecy? Will they be disadvantaged if they don't participate in this digital phone booth? My gut tells me yes.
Obviously any sort of serious effort will need some sort of marketing or other social push, but you can market a pile of dog poop all you want and nobody will be interested.
That same divide isn't going to go away, no matter the technology. (ofc replace Facebook with whatever app is popular with your group.)
The craziest thing started happening when I got rid of it. I started getting these crazy old things called "phone calls." And people started sending out these really cool decorated cards called "invitations" that apparently come to my house through this really old but fascinating technology called "mail". Real life actual people started walking past me on my neighborhood road and inviting me to house parties or get-togethers again. I met so many wonderful neighbors since!
It had this amazing other side effect as well: it acted like a filter for all the events I used to "miss". Suddenly, it's as if the weight of FOMO was lifted off my shoulders.
But illustrative snark aside, I suppose its going to vary from circle to circle and group to group. My hunch tells me a lot more people simply tolerate social media because they realize much of society has hitched it's wagon to it, and they see this as an unfortunate thing, and it will take just one person in the group to break the mold.
If we could separate out these layers I think you would find that the user experience would be easier to improve and evolve more cleanly over time, with multiple formats and protocols being built upon a base abstraction layer.
Mastodon has been around for more than five years, and the idea of decentralized social networks long before that. Email, from a user standpoint, was much like Mastodon: a protocol that you consumed with software of your choice. But it was never a great experience for the average user, then gmail made it a great experience. People switched very quickly.
The experience has to be first.