I don't know about that. A lot of people frequent multiple subs, and so long as they are unique enough people have no reason to not split up. For example I would usually check the front page of t_d, browse the comments, then go to subreddits that were based around my other interests. It helps since once you go past the first couple pages of any sub the content tends to get thin, and if you don't feel like discussing politics one day you can engage more in other communities.

Maybe just a couple different ones for specific subjects like gaming, guns, and movies / tv to begin with.