This is the worst take. You take any good journeyman from last gen (Roddick, Blake, Nalbandian, Hewitt, Verdasco, even Gonzalez) and they would carve through the current field like butter. Could you imagine a kid like Roddick with a monster 140mph serve and big forehand hitting the scene right now? He'd go HAM on all these mugs (+3 old guys) and clean up titles.
The level of play has absolutely fallen off a cliff. We went for 40+ years with each generation pushing the next one out, and suddenly there's nothing left to fill the void. A few decently talented meh young players. I don't know who or what's to blame, but kids aren't playing tennis anymore.