I don't think so, it doesn't mean you can't capture bases elsewere. It just means that to score points you need to focus your dudes and work in a general area, instead of spreading out.
Doesn't mean you can't feignt here or there, or take bases elsewhere.
What it does mean, is that you're not going to have points scored wholesale left and right, and i'm fine with that.
Focusing players in 1 or 2 areas is something that I think a lot of people want to see. Requiring adjacent field captures is going to do that and I think it's a great idea. People WANT a good fight, they don't want a base snaked wholesale clear across the other side of the map that they didn't have a chance to defend.