ActivityPub is today what Paul thought he saw in Twitter in 2009. Except AP it is not owned by a private company, which in hindsight, seems like a critical factor if a protocol should be able to survive and thrive for decades.
or maybe we need more generic clients. Something that can consume mastodon et. al. posts! Would be neat to have Lemmy + Mastodon + personal blog posts etc mixing together into a single feed, RSS style.
I have also been thinking in the lines of a generic "all-in-one" client. The only reason this is not common yet, is old habits from decades of captivity in silos. I believe we will see such clients developed in the next few years.