i think it would make things fun for casual team games, at least for zerg. zerg can go ling-> fastest lair -> tsunami zerg, with infested terrans. ensnare and queens would also become regular, as ensnare's reduction in attack rate helps infested terrans live longer and ensnare's speed reduction helps them catch their prey. i haven't played a single game of sc2, (and i am dead set on keeping it that way =P ) but i imagine it would be a lot like ling/baneling.
what are thoughts on how it would play out in BGH//FPM??