As you know infestors are a hard counter to MMM. my question is what happens when they do get a decent amount of festors to fungal your army. They can destroy your army and it costs alot to move out of it. Any suggestions would be great :P.
Ghosts! EMP = range 10, Fungal Growth = range 9. You can try cloaking in and getting off a good EMP, or snipe a ton of infestors super quick.
But honestly why are you using MMM at the stage of the game where infestors are in sufficient numbers to wreck your army completely? You need to have tanks by that stage.
I've seen once Sen getting beaten by pure Marine Medivac on his stream. That's possible but you need to be super active with your marines dropping like crazy, always battling in small skirmishes, derail his macro and attack every where with small groups, never letting him the time to attack your base and massing a huge army. In fact it is certainly easier to play marine tank and even easier to play mech.
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