Guys, lets think with our brains for a moment.
Pïrlo is the only playmaker in our team. We badly need one as seen in games without pirlo, we struggle and fall down into just running and punching the opposing team.
Pogba, is not a playmaker. He's an awesome allround talented CM, and will replace Marchisio in the future, but he's not a CM. His creativity is limited to longer passes or individual actions
Pirlo must be replaced by a real playmaker.
Ideally, a transition regista, such as xabi alonso, as pogba will take a while to become defensivelty and tactically better then marchisio
but once he is, we can totally play vidal-pogba, and have a CAM/trequartista in front
But no, Pogba cannot replace pirlo. And no 3 fancy forwards wont change that.