Theoretically, he could. It's unlikely. He'd have to luck into a supporting role that made him look very good. The thing is, action films are really dependent on the international market - where very few have any idea who he is. China especially is key to it. Apparently the Rock is huge there. Stallone of course has 40 years of name recognition. Gronk is just another steroid head looking guy - he's not going to be allowed to carry a big budget film - he just doesn't have the name for the budget. Even in the US he's not a name that is going to get people excited for opening weekend. If he's retiring for that, then he's foolish. If he's retiring because he's tired of the beatings he gets during football season, and thinks that trying to act would be fun - fine.