When I have time I want to look up how old Dolgopolov and Anderson are, and more importantly I want to see in whose books they are considered "rising players".
But the theory makes sense. Although, couldn't slow surfaces just mean a different group of youngsters will dominate? What difference does it make? There are young guys from all over the place. Maybe some of those young spaniards that aren't as hot on the radar now because they haven't had the most amazing junior careers will start winning slams and breakthrough once their training pays off? And the people we talk about now (Dimitrov, Raonic etc) will end up being the next Roddicks and Gasquets because they are good players but the surfaces just aren't suited to them. There'll be stars and grand slam winners regardless, just because the current crop of hopefuls seem to be tailor made for faster courts doesn't mean the ATP would cater to them, if that were the case they would never have made the courts slower from the late 2000s - why would a tournament like Indian Wells or Miami ever want to slow their courts down when you had players like Roddick, Fish, Blake as the next big things in America.