Since this thread's title says "Suggestion", why not change the MG or GG servers into a Zombie or Human VS Predator one? It'd attract more people and would be so much fun.
Meh, yeah zombies do get boring after a while, but at least that would attract players (hopefully) instead of an empty GG and MG server. (Though minigames are so fun). Why not combine surf and Minigame? I haven't tried Humans Vs. Predators yet, but I've seen cool videos about it on Youtube.