Color and Opponent rotations? Maybe?
I was on Borlis Pass during the 13 year war with Anvil Rock and Ehmry Bay and WvWvW had healthier turnout back then, I can’t imagine now. Not only do you learn a server’s tactics but you learn their population dead zones, which is how PPT climbs. Colors should be more random but the thing about randomized opponents is that it would, more often that not, emphasize the exponential participation differences between servers and players involved would likely end up thinking “Hey this is sucks too.” and end up back at square one where they’re not having fun.
To extend on why random opponents won’t work, many of the core issues have not been addressed, instead we got WvWvW ranks and the resulting power creep (which we had to bicker and kitten about for months to get an account bound implementation finally), the Bloodlust Ruins(we can debate the utility and fun factor of that til the cows come home) and EotM, while pretty, the rewards compounded by lopsidedly designed regions encouraged karma training. It didn’t help that when the map was first released, even your ally names were anonymous. Bah anyway rant over.