It's just more complicated than that. I've played in dozens of poolrooms over the years and no two are alike. Being "retro" is a nice theme. I've always enjoyed it. But, success isn't found in themes. It's about constantly trying to monetize every square foot of your space while remembering what you're about.That's where the Retro theme comes in, young folks dig it but would love to get real feedback from them.
I know a room that recently closed that leaned into the retro theme. They had no televisions because the owner (a friend of mine) strongly believed people should leave television at home when going out. I know for a few years, he struggled to get his room out of the red. I don't know if he ever did but he's closed now so I guess that's the answer.
I think you have to be very cognizant of who your competition is, what they offer, and why they're successful. And then, do it better. In your area, retro might be part of it but there's another 95% you have to answer for.