Meh.here has never been a greater variety of new, interesting rock music (not to mention music in general) than there is today, or easier access to it. Their logic is flawed, and there is no less "blues influence" in rock today than there was years ago, but there are a lot more types of rock and a lot more outlets for it. These dudes clearly just stopped listening and dismiss whatever they don't know, and make the mistake of asserting that anything that doesn't fit their narrow idea of what defines rock is inferior. They just sounds like a couple of guys who haven't kept up with the times yelling at the kids to get off their lawns.
Classic rock is fine, I love a lot of it. But for chrissakes, great music didn't stop getting made in the early '90's, and not all great music has to stem from the f-ing tired old boring blues.