I'm 100% in agreement with Amy on this. I think it's a great idea, including the thought of turning them into quest hubs.

I'd like to add that immersion can be improved with added exploration options, too. Take down all the invisible walls that are designed to keep players out of places. Let us climb up into areas that maybe have no purpose. It's a very beautiful world and many of us would like to be able to explore freely, but we can't because of the invisible walls and inability to climb up into other places.