What it seems to me people are actually asking for with the war win requirements changes could be met by simply this:
Instead of a percentage, have the war win based on having 90% of your bases, and a certain number of bases taken from the opposing sides. I'm not sure what the right number is, but maybe around 15? Then it wouldn't matter what size map it was, the requirement would be the same and maps would rotate through at similar speeds.
Edit: And, I agree, 7 days is too long, should be 4 or so. One map shouldn't cover 2 weekends.
Wiley.