Konami has to get the leader types back by giving them what they want, and that is a more realistic experience than FIFA. However in today's world I guess online plays a major part for a lot of leader types too. If Konami makes a good game but still can't match FIFA Clubs (10 vs 10) then I think you'd still have plenty leader types sticking with FIFA (but not the majority).
U dont really need 10 vs 10, its nice to have such option in the game, but 5vs5 or 6vs6 f.e. is good enough.
We need to have option to play with our friends games against human opponents from all over the world feels just so rewarding when you can create your own team and play as team online.
Its all about gameplay but still its a game, u want to have fun playing that, and for that matter u need good online modes, otherwise people will play that other game.