i don't think he'll become good.But if he does and if it happens b/c of Naruto's speech(that is really lame) it won't happen untill Naruto beats him up and maybe than Pain will die. (which i don't want to happen it would totally ruin the ending of Pain arc)
no he cant hes to deeep to shit to be turning into a good guy now
and plus that will ruin the manga unless!!!!!!!!!!!
IT WILL END UP LIKE NARUTO AND PAIN VS SASUKE AND MADARA
then i wouldnt mind