Let me take a stab at this as someone who likely knows more about Geno than any of you.
First, I'm not going to suggest that Geno wouldn't want to ever coach a men's team. I imagine that's in the back of his mind somewhere. However, his first and foremost goal is to get women's hoops competitive beyond a half dozen teams. That's why he opens up his practices to any coach who wants to learn how he's achieved his success. UConn practices are brutal for both men's and women's teams, but it can be argued that the women's practices are more brutal. He's legitimately pissed that he's able to run over so many other teams because of poor conditioning and fundamentals.
I'm sure he's also not pleased that the entire AAC TV compensation is no better than what the women's team earned on their own from their TV package with SNY when back in the OBE, as well as having zero competition within his own league, losing both ND and Rutgers. So he does have some reasons to leave if he felt it was time.
He does get many of the best players, but not all of them. Usually when he doesn't get a top player it's by choice because said player won't fit into the culture, although there are exceptions. I don't think he'd do well at attracting top men's players because he wouldn't be able to deal with the AAU BS and one-and-dones or early departures. That doesn't even address the fact that he has no recruiting base with men's coaches anywhere and would have to do a ton of convincing that he knows how to handle male teenagers. He'd have to hire a staff that would buy into his idea of how a program should be created and run.
To that end, let's say there are 20 decent women's programs in a couple of years and Geno feels he's done his job. At that point, if there were an opening at say, LaSalle or Drexel, I could see Geno committing to five years and making the tourney within three years. It would be much easier to get 2* and 3* kids to buy into his philosophies as none of them would be coming to those schools for an NBA career. He wouldn't get the best talent, but he'd probably have the most well-conditioned and fundamentally sound team that would be a PITA for anyone in the A10 or Colonial to play.
But he'd be a bust at the P5 level at any school with expectations of getting top recruits and quick results.