Well I'm not sure how adding more options and opportunities would cause less interaction. I'm not trying to suggest it should be entirely about PoBs but they would augment the whole thing. Maybe not every planet would be mineable, and it wouldn't always have to be ore. Why not artifacts or cardamine as well? Depending on the planet of course.
However I'm up for other suggestions on how to make them more interactive other than just flying into them and docking on them. It would be cool if people could build their own docking rings or something to 'claim' planets for bases. So thats not resource based at all but would still give them a reason to become the center of a plot.
As for its complexity, I also wouldn't want it to be too complicated. That's the biggest hurdle when you wanna try to change one thing, you have to try to figure out how it effects everything else. I'd like to see something like this incorporated into the game and made as simple and easy as possible. Will it ever happen? Hey, I'm sure there'll be a 4.88 eventually. It would be cool to add new features other than new ships and changed weapons. Vanilla planets didn't even rotate!