These are certainly possibilities! It's happened elsewhere in the Fediverse... but already we can export most of our data and migrate to a different instance. Getting these base features right is important before enhancing their functionality. Planning for the future is important too. So far I've been impressed by Lemmy, though it's not nearly as portable as Mastodon or Calckey or Pleroma etc. Part of that is that in Lemmy/kbin we don't follow other users... we subscribe to groups (subs/communities/magazines).

Still, with the nature of ActivityPub, it's inevitable that migration tools for Reddit-like federated apps will get built quick-like