Simply consider this. We talk about system bandwidth in triple digit GBps. We talk about system latency in single digit nanoseconds.
Offloading tasks to a separate server would give you a bandwidth in single digit MBps. We're talking about triple digit milliseconds of latency
This is not feasible for anything that would show an immediate reaction. The only thing I can think is having AI run actively at far distances. It could make something like a single player PlanetSide 2 work where each AI is actually being simulated instead of dice rolled. But who wants to play PS2 without real people?
Yeah, but dem Madden crowds, amirite?