That's a great idea, but I'm not sure it would work. Aces High II has the best netcode I've ever seen, but the graphics engine stinks. I'm not talking about it looking bad, I'm talking about the way you get terrible frame rates for a group of textures and shapes which, in another game, would have a great frame rate. For instance, Lock On: Modern Air Combat looks better than Aces High in every way and has a greater view distance as well, and it still has a better frame rate than Aces High (on the other hand, Lock On has a mediocre netcode).
I think that if you added that many more polygons, the frame rate would hit the floor. Right now a hill requires only three or four polygons. Making them look smooth would require dozens. Imagine how choppy the game would be if suddenly it tried to take up ten times the amount of resources for hills that it does now.