I remember back in the day when PES atleast competed with Fifa in terms of Sales. Critically it was acclaimed as the best game, sales wise Fifa was usually ahead (because it came out on every platform going).
If PES can get back and compete, it can only be a good thing for Football/Soccer games.
PES used to dominate FIFA in sales too but not on the degree that FIFA now dominates. The shift started to happen with FIFA 09 and it only increased with time.
Thes biggest hurdles Konami have in their hands is the licenses for leagues and teams and people's love for Ultimate Team. I would like to believe gameplay is always king but that's not the case.