ok, here an amendments to the proposed system I have been brainstorming......
1)To allow for the war to be won in a realistic amount of time, have small maps.
2) When the total number of players passes a FIXED threshold and a certain clock time is passed, a new arena opens and new players go there.
3) When the total number of players falls bellow a FIXED threshold, and a certain time has passed, the less populated arena closes. The state of this arena could be saved for when it gets opened again due to demand. The close doesn't need to be sudden, it could just be that no new people can log in, and it closes when the total number of people falls below yet another, lower fixed threshold.
A whole new dimension of the game could be added, not just win the war, but win the war before 'time' runs out. This would be silly with todays huge maps, but with smaller maps, this could be done.If two small maps isn't enough for the player base there could be 3rd or 4th or X.. depending on the total number of people playing. Combine this with a local eny system, and you could have combat spread across the entire map, instead of just one huge furbal in one area.
Snailman, if you have any other suggestions, I'm all ears..errr eyes..