Well he would most probably be a starter at Barca after Neymar left. Who did we have better than Pedro on the LW until this season with Rahpa? I'm sure EV would love him and he'd compliment Messi and Suarez perfectly with his energy, running for them in defense and making runs from LW for Messi's passes. We would see a lot less of that boring 4-4-2 if Pedro was around.
I understand he left because at the time it looked like he won't be able to be a starter for years but in reality Ney left quickly after him and a spot at LW opened up.
I wanted him as cheap backup when he was leaving Roma and I think he even said he would love to return but now it's too late but Pedro will always be a Barca legend, a lot bigger than Ney.