If the adoption rate continues and quality of life improvements such as efficient mobile apps keep getting made, I think it's inevitable. But I also think it can be a good thing, especially if the distributed instance culture with semi-independent communities persist. If the culture shifts so much to instances just being nodes into the larger "verse" so to speak, the general experience could shift a lot with it.

In any case, with all the different user experiences available already with Mastodon, kbin, lemmy, Calckey, Pixelfed and Peertube offering vastly different experiences into the same ecosystem, it'll be a lot more diverse I believe as everyone will find their own comfort zone.

Once more mobile apps come online that help streamline and make sense of the fediverse, I'd expect a lot more mainstream participation. But also too, maybe they'll stick to more popular and catered instances and smaller ones will glide under the radar.