By the time the eggs that the facehuggers layed in the bugs have gestated, it would be to late. The only hope that the xenomorphs have is the facehuggers. If it's just the arachnids against the xenomorphs, the xenomorphs win with ease, but an army of humanoid xenomorphs against the bug army seems to one sided. Either way, the Bugs just have to much fire power and diversity in their army. Are the Bugs smart enough to realize that after a facehugger lays an egg they are going to die.,are they smart enough to even realize that the facehuggers are laying eggs? I don't know, but i would doubt it. However, It is possible that the Xenomorphs would never be destroyed because of the facehuggers. If this were the comic xenomorphs, The bugs would be destroyed with ease. The bugs have to much going on in their arsenal. I would be insane to say that the Xenomorphs can win. However, if this is a full on xenomorph vs bug war, Based on the movie incarnations. The physical structuring of the xenomorph make them far more agile than the bugs.
