Hi,
it will not crash, but of course it depends what these fsm do, it's not the fsm the trouble, its the actions you use, some can be very expensive or take memory, but 100s is fine.
however, you should definitly use a pooling system to avoid instanciating and instead simply enable, it will massively improve handling of such routines ( with or without PlayMaker). You need a pooling system that create the pool during editing, so that all your pool instances are already there when you open the scene.
Bye,
Jean