It wouldn't surprise me if Stoops want to coach again, but I'm not sure it's college. Not having to recruit can be seen as a plus. All depends on what a coach wants. Maybe he enjoys being a mentor and coaching college players. Maybe he has no interest in recruiting and dealing with practice limits and player eligibility, and just wants to focus on football. (like Gruden for example)
If he ever did come back to college, I'd guess it would have to be an ideal situation for him with a lot of flexibility as far as hiring and his responsibilities. Maybe a short term obligation with a head coach in waiting in case he wants to retire again.