Last week, I posted a story from the Mittani detailing how Goonswarm beat Test, not specifically on the battlefield, but by breaking them as an institution.
While it's a clever and effective tactic, one has to wonder if it is a good tactic for the game at large. One thing I've noticed is that when a guild or group breaks from drama, a significant percentage of players just quit the game outright. I would imagine that something similar happens in Eve when a guild breaks because of meta-game tactics.
Even generally, though, what should a PvP sandbox do with the losers of a PvP war? For the sandbox to be meaningful, they must lose. But for the long term health of the game, they should not be pushed to quit.
Perhaps the winning side should have an incentive to absorb the losers. There's a lot to be said for this approach. For one thing, it pushes the winning side to be more "gentle" in their tactics. If you pursue warfare by any means necessary, the losers won't join you after the fight is done, and that weakens your long term position.
For example, maybe in Eve there could be something where every planet has a governor. Only one planet per account, and the governor has to continue to keep the planet in health. So if an alliance conquers more planets than it has members, it needs people to maintain those planets. Simply absorbing the current governors into the winning alliance structure gives you people.
For the losing side, well, you lost the war. But now you are on the winning side, so maybe you keep playing with new people.
Of course, the issue with this is that it's a case of the "rich getting richer". An alliance which wins a war due to superior numbers has even more numbers after the conflict finishes. That could set up a positive feedback loop which pushes the alliance to dominate the game.