It's the natural course of the life cycle for bands to be less productive and less 'relevant' as they get older and/or advance in their career. There is no way the happy, rich middle aged man can or should write the same song the angry young man scrapping his way up did. It is no offense, it happens to all the best, including the Stones, Dylan, and members of the Beatles and Led Zeppelin. It's really not a big deal or a problem, I don't think. As long as there is music I enjoy, old or new, they are worth something to me and I don't expect them to go out there and compete with the new, young stars because they are not in that category.
The problem I have is people putting them down while holding fucking Pearl Jam up as some kind of example, when, though you have every right to love and adore them, haven't been 'relevant' in 10 years! WHY are they so fucking glorified?? They can't hold a candle to U2. They are more in the category with Phish, a cult following band with diehard fans, but not important on the scene.
But really, WHO CARES? Also, what is the definition of 'relevant' to you people? Do you have to be followed by teenage gangs to be 'relevant?' In that case, rap bands are! Do you have to sell oodles of records? In that case, Britney and the boy bands are! I mean, please! Just be glad they are still alive, still together and still productive!