I think even if nothing is intentionally done about it, it will get better. A dominant community will emerge, and other communities will evolve to have their own unique quirks. We're still in a kind of wild phase where every community is trying to find its place.
That said, some kind of multi community organ6would be a very welcome feature.
For that to happen though, the discoverability of communities needs to be better. Right now, searching for communities shows the number of people who are subscribed to it from your own instance, and not the true user count.
Integrating the functionality of lemmyverse.net into lemmy like in this github issue would fix that and needs to be done asap; it's probably the biggest hurdle for newcomers
I think even is nothing is intentionally done about it, it will get better
Maybe not, considering the dynamic is different. On Lemmy there’s different instances that can have different people talking about the same topic, some will defederate each other so they might not even see that for you there’s a duplicate etc.
Merging it all into a mega thread is an option, but poses the question of which one will you comment to? This has to be explicit or it will cause confusion.
Mtgere are differences yes, but most of the instances that are significant are federated.
If the fediverse does not get too fragmented, I think it won't be too different, but I grant that significant fragmentation could potentially be a problem.