Gotta agree, vehemently, with Mad Hack, and baniak (hey, that rhymes...)
Music on the radio is no different from mass-produced sculptures or paintings for sale. After a while, you cater to what your customer wants, not solely to your artistic desires.
Since the day that the music died (and probably long before that), popular music has been a product. Not art. Plain and simple. And as long as people are buying that product, they'll keep selling it.
Every once in a while, truly influential bands come along, and shake up people's expectations of what music is. This is a rarety, not a common occurrence. Sure, we can look back at the 60's, and say "wow, look at all the influential music that came from then, there's nothing like that now". But hindsight is easy. How many crappy bands put out crappy products in the 60's? How easy is it to forget that?
The Beatles, the Beach Boys, Elvis, the Doors, Zeppelin, Black Sabbath, The Sex Pistols, Pink Floyd, Metallica, Nirvana, Pearl Jam; these bands are the exception, not the rule. Don't lose any sleep over then fact that you can't identify what band will turn out to be influential from right now.
BTW, if you want to hear bands pushing the musical frontiers in "popular" music, I submit that Radiohead is probably the best example of a band today which will be remembered. Like 'em or not, they are not just putting out a product that they know that their customers want to hear.
Lastly, take a listen to the first several Beatles albums. How much fluff ("I want to hold your hand") did they have to put out, in order to gain the credibility to truly experiment, and not lose their record-buying audience?
Let's not be hypocrites, here...
-mg