I'd like to make a couple suggestions for alternatives to base capture.
Instead of winning war through land grabbing, win it through the destruction of a country's resources. Like refineries, factories, transportation, food, etc... like ion the real war. When these resources reach a certain level of attrition, the country surrenders and the war is won. Though bases can't be captured, they can be destroyed and their rate of repair affected by the country's level of resources. I think this is more realistic and will allow a country to retain bases for continued playing up to the end. And the bombers will once again become a weapon of value.
Another, if base capture can't be eliminated, at least divide the arena into areas where capture is allowed and the war one in that area alone, and other areas left intact for those who wish to fight each other for a base or two. This way the land grabbers can do battle with real estate without messing the place up for the aerial combat enthusiats.
In the early days of AirWarrior we had neutral bases that could be captured, (usually for their strategic value) and country bases could be destroyed for a half hour, but not captured. This allowed players to do battle all night without complete ruination of the arena. It worked quite well.
My displeasure with what we have now is due to encouragement for players to capture bases by any means available (like massive swarms, suicide jabos, and avoiding combat by attacking undefended bases), and disruption to players who don't wish to have any part in the land grab hampster wheel.