I some sense, i would rather have him, come this summer, because he would have more time to settle, a full summer with your new team mates, getting to now them better, ther new city, the new tactics etc, and i rather see him with the #7 on his back
I hope Pirlo still stays with us after the summer, so that he can teach him, his free kick technique, a lot of people are very secretive with stuff like that, but considering that he would be retiring, i hope that he would pass his knowledge on!