Yes, the possible superficiality of local relationships is a trial, but just remember that we all do need a bit of superficial conversation and gossip and discussion about what the DCs could possibly be thinking when they do x, y and z.
So the answer is balance. I've managed to get a bit of balance online with mumsnet, trying to make more of an effort to talk to DH in the evening, trying to see friends more often (though they keep cancelling... or I have to because DS is ill), doing a bit more writing, and the seasonal effort of the Christmas cards.
Just go after interactions of all levels, and somehow your social life and needs will feel a bit fuller. It's a harder slog than getting your interaction at the office and after work (sooo much easier to go out after work, and don't the DPs know it, dammit?!), but that's what we've got to do.
In the meantime, maybe start throwing in some different comments when you are meeting up with your local friends. You never know what jokes and new conversation ideas they may respond to. I've had mixed success with this, as I still don't know people well enough to always pitch the correct ideas, but sometimes proper, and deeper, conversations do flower.