Probably merged with all the other ActivityPub frontends into a single, hyper-customizable mega-app.
I may have a user bias, but I think KBin is already started down that path, of actually making a usuable platform for both communities and users. Unlike say Lemmy that doesn’t even really let you follow individual users, and Mastodon, which lets you follow Lemmy Communities, but its hard to follow threads because every post just looks like a Re-Toot by the community “user”
Then again Friendica is pretty nice too, it treats Lemmy communities just as if they are Friendica Forums, and it supports other platforms in addition to ActivityPub, including Diaspora*, and allows for integration with Email, Calendar, etc. with several very different “themes” to choose from, with the default, Firo(?), being a UI ver similar to the world’s most popular social media platform, Facebook.
I tried using Friendica as my main Fediverse hub. Unfortunately it still has big issues regarding the handling of large lists of users (I, for one, follow around 1000 Mastodon users plus about 300 Lemmy/Kbin communities), so with much pain in my heart I had to return to dual-wielding Akkoma + Lemmy.