Great column, Artemi!

And very sad, too... Thinking of that makes an em musician of today feel like he's an orphan
The point with the stars above mentioned is not that they changed the kind of music they made, but the fact that their music is no longer as good or creative (with some exceptions, of course) as it used to be.
While it's obvious that one can't possibly be innovative all his life (it'd be totally crazy to expect that), the general feeling is that for most of these stars music has simply turned into a job, as opposed to a creative urge.
Creative direction and personal exploration are mostly missing.
Even if we think of other artists that are not expected to be creative but simply commercially successful, we can find examples em stars should follow...
Think of Madonna, for example: she's been in the business since the 80's, and she's been constantly renewing herself while maintaining her own style. You never know what she'll come up with next, but quality and direction are always there. And she's just commercial music...
If the em stars had done the same, we would all be happier, I guess.