I'm starting to think Linkin Park came into the music industry at just the right time. Peer-to-peer file sharing hadn't completely destroyed the record and radio industries (although they were slowly eroding), and the band had just enough pop appeal to the masses of pop listeners at the turn of the decade. This allowed the band to build a groundswell of fans (20M copies of Hybrid Theory were sold, for example), which the band have been able to feed off of for the last decade. Being around at that time, this fanbase most certainly wasn't comprised exclusively of rock fans, I can tell you that.
I'm not sure if we have the conditions for another rock band to "make it" THAT big again. And I'm not sure the currently popular new rock bands of today will be able to achieve the sustained success that Linkin Park has, allowing them to become "great" or "generational" instead of 2-3 year wonders.