The Real Feat Would Be Changing The Past

Phil Coulson: 

Got to admit this time stuff's always been a little over my head. 

Like, in Terminator. 

If John Connor's alive and able to send his friend back in time to save his Mom to make sure he's born, doesn't that mean he doesn't have to? 

Lincoln Campbell: 

I, uh, I never saw the original Terminator. 

Phil Coulson: 

You're off the team.

Jemma Simmons: 

Do you think we can do it? 

Change The Future? 

Melinda May: 

Every move we make changes The Future. 

The real feat would be changing The Past.