Personally I can see combining the EW and the MW. Especially if we had a custom map, so Early war was on one side, Midwar on the other with 30+ k mountains separating them.
As to 2 sides, which are you going to leave out?
If I log out of late war because knights are down to 7 fields, I really am not going to want to switch countrys. If I wanted to do that I'd stay in late war.
Changing from 3 sides to 2 is still going to leave one side outnumbered.
While a little bit of milk running strats to improve rank is one thing.Continuous landgrabbing of undefended fields always seemed a bit like masturbation to me. I mean really, whats the point?
On those rare occasions when Mid war does get up to 50 + people on the fights can be very very good.
I'd be much more in favor of doing a series of trial arena's. Set them up for a couple of months and see what happens. Short term any or all of the below ideas will see action. However just as EW & MW tapered off after 3 weeks as the new wore off. These would have to be enabled for a minimum of a couple of months to see if they'd be used consistently, or which would be more popular.
A Bomber heaven.
High alt bases where only bombers are enabled, loads of strat objects to hit.
Towns and city's to level, etc. Limited fighters available only from sea level bases.
B GV wars
No planes enabled anywhere on the map, strictly war designed for the GV fans.
C Dogfight central
A 9 - 12 low level bases around a low central plain or lake. No bombers, ground vehicles, ord, or field capture enabled. You could also setup some canyon fights on the sides. Focus would be pure and simple dogfighting.
With a bit of terrain work you could even have 4 such centers on a larger map. With different plane sets enabled at each one.
The potential is there to do so much with what we already have.
Would just take a bit of terrain building and setup time.