The key is to go back to a more traditional way of playing. Midfield needs to provide great passes as well. You can't just overuse MSN and get away with it all the time. MSN need to have some of the creative licenses redirected to a ball playing midfielder. Righ now, we give a lot of freedom to our stars, to the point that their form dictates the success or failure of our performances. Instead of running things through a playmaker in midfield, we just give ball to feet to Neymar to make something happen.
Messi is not a midfielder. He needs to play in a more advanced role, and be played by someone else. He has a killer final ball, but doesn't have the mobility required to be a Xavi like influence in midfield. Due to Messi's lack of work-rate, we automatically need a player with great service. The less mobile Messi is off the ball, the more precise the new midfielder must be with his passing, because the passing windows are shorter, and narrower (basically you have less time to find Messi, and less room for error when you try to pass to him, because a - the opponents mark him a lot, and b - he makes your job harder because he is quite static).
