between 20 and 30 probably...
I think you guys are expecting too much from him. He will fit excelent in your team i reckon, but if Ibra stays, villa will be kinda, wasted as LW... He is CF/SS, so the way he will be scoring that many goals is to play him in his natural position, and Pep said Ibra will stay, that means Villa as LW, and you are still expecting him to score 30+..
I don't think it's gonna happen.. He will score 20+ and assist often, be essential for you, but do not expect that much or you may be dissapointed like you are with Ibra...