We certainly need midfielders that can push the ball forward more quickly (either themselves or passing). Take Hamsik, for example: he is leading the league (or was) in forward passes to the attack. He is the spark to Napoli's attack...starts in midfield. Khedira is slower than dirt, Matuidi isn't very technical...so yeah, it certainly hurts our offense. Neither Dybala or Higuian are terribly quick , that doesn't help but if we had more technical midfielders that weakness wouldn't be as apparent. You can't play with midfielders that somehow only manage 27 touches on the ball in big games. We need to sort that out and find mids that can impose themselves.
The only midfielder in Italy that I see instantly taking our midfield to a higher level would be SMS but we would need to sell in order for that. Sandro & Rugani maybe?