So something along the line of Raven Rock quest storyline from Morrowind's Blood Moon expansion? I'm looking forward to that, although I'm sad there's not more management/simulation option for basic followers planned.
I do think if you commit to the whole settlement questline, maybe there could be an option where the player leave their followers as settlement guards with some basic need system to keep them working there? This could be a reasonable way for the player to store/collect followers. But obviously you are still the one who is developing the game, so it's your decision to include something like it or not.