there's three kinds of band evolution:
1. where the band doesn't change a bit.
2. where the band changes for the better.
3. where the band changes for the worst.
and as fans who buy music and go to shows, it is up to us whether we like the new or lack of direction.
don't worry, if whorebands stop making their accustomed to millions, you'll see them quickly revert to their old style, and they'll claim they're getting "back to their roots."
and if they proceed in the same evolutionary direction despite sales falloff, they you know they're into music just for its own sake (even if they still suck monkey balls._)