The thing is, what a lot of people are forgetting when they talk about another "shift" between FIFA and PES, is that FIFA has A LOT going for it beyond gameplay, from the licenses, to Clubs, to FUT, to the new EASC, to the VPs. You could say that EA consolidated its gains made on PES starting with 08 by hooking fans on their various services and assets that PES cannot provide, so even if the consensus becomes that PES has overtook FIFA in the gameplay department, it's almost like we have a situation where FIFA is too big to fail now.
As much as many of us would like to see Konami shock EA in the way NBA 2K did, the reality I'm afraid is that FIFA is quite secure in its dominance and I just don't see another shift occurring any time soon, except for the hardcore who value core gameplay above all the bells and whistles. I would absolutely love to see PES give FIFA some real competition, or another studio, whoever, but I don't see it happening. Especially without the licenses.
Do not underestimate the power of EA!