They should take last gen's engine and build on that, just like they should have from the get go. What they have now sucks, and there's nothing about them starting over or building on what they have that would lead me to believe we'd end up with anything better than what they're currenty producing. In my mind, EA hs literally killed football video gaming.
If they don't start over from scratch, my standards have been driven so low by EA that I would be happy if I just had control over the guy I was controling on defense. e.g. when I hit the pass defend button my guy actually performs some kind of move...ANY MOVE...SOMETHING!!!! I'm not holding my breathe for that to happen though.