Depends. If it's stuff like Wolfmother and The Black Keys which err to closely on the coattails of the past, I definitely think it'd be considered retro, and that stuff usually doesn't interest me. Alternatively you have something like Grunge, which combined influence from Sabbath, Purple, Zep, with many other things to make it new and original.
I've always had a skewed view of "rock" anyway, growing up with Neil and Dylan as my mentors. To me a solid drum beat, a clean guitar tone, a simple unambiguous verse/chorus, that'll always be what rock is about for me. Even if a lot of people would call it country, or pop, or folk, or who knows what.
I would have to agree with you, AAG.
I have racked by brain trying to think of something "NEW" to revolutionize the rock world. I dont see any room for anything innovative.
The most innovation I have seen recently would be adding operatic females/males, with ochestra-like metal. But the people who tag these genre's have called it "gothic". Not sure I agree with that description, but I do like the music.
I can remember when the Punk scene evolved. It was not well received at first, now it is classic. I guess we just have to give the music of the 2000's time to perculate, and see what critics have to say in a few more years.