Terrain size is not as important as terrain layout.
We could have a larger terrain (512x512 miles) but with continental geographies and a mulitiude of strategic qualitites layed out in a manner that gives wide opportunity for gameplay yet allows the community to stay in one large arena.
Visualize, if you will, a very condensed area within the terrain encompassing many elements (basically a small arena) and larger, flater areas with fewer but far more important (strategically)
elements.
Speciall places in the terrain designed especially for GV warfare.
Coastlines especially suited for Amphibious attacks against strategic assets.
Water Straights with passages to important regions
deep within the terrain.
As long as there is a small area of the terrain well suited to fast and furious dogfights (with assets hard to hit, protecting quick access to gameplay) then people who desire more planning and have time to execute intricate missions can share the same space with dogfighters.
The possibilities from a designers perspective are intriguing.
Y