That plus two DM's in the squad would be good enough for me.if we have Keita/Coutinho/Lallana, i think that could be ok ... 3 players who can play both sides of the ball.
Those three together would get overrun. The reason why Keita can make so many forward runs is because he has a DM covering for him. Starting Lallana, Coutinho and Keita would mean zero defensive cover and back to square one.
Also, Coutinho is so gone next season.