AI controlled bases on planets won't be having ships standing off to keep you from landing on the planet, they won't have ships patrolling the system to keep you out, they'll be bases on the planet that you get attacked by when you get close to the base itself, that's it.
Players controlling bases on a planet, they'll have ships standing off to keep you away, they'll be patrolling the system, this is already happening IN the game right now without the bases to control, these units have NOTHING in the system, they simply patrol is kill all players who show up. Giving them bases will make it worse, as bases are a static thing, they'd need to extend into Group and Solo modes, exactly as all stations do currently, as all bases will do when Horizons hits. This would actually give groups the ability to mess with the Solo and Group mode players, and that can't be allowed.
IF we can get stations or bases we own, something David said he wants in 2014, odds are those bases won't actually be under our control per se, we'll simply own them, be able to name them, maybe make profit off them from traders and the like, but that's probably going to be the extent of it. We won't be able to set no access lists, people will be able to come and go as they please in all modes. IF we even get to that point, as that was something David wanted in 2014, but lately, he's been clear that that won't happen, no player owned stations or bases. I think FD looked at the possible consequences and decided it's not worth the hassles it would cause. "what do you mean, it's my station but I can't say who can or can't dock here, that's not fair!'..yeah, that's exactly what would happen to, and that won't fly with David so it's probably been pulled off the table due to the players in Elite already being selfish and childish, I can't see David, who's not real impressed by groups in the first place, being happy with that at all.