I still have yet to see how bands are "deceiving their fans" when they go on without a member of the band. Hardcore fans know the lineup changes and casual fans of any band that have been around with for 30 years or so, certainly know that many bands change members.
By this theory a band that has a member leave must give up the work the other band members also had input in creating.
Subsequent incarnations of a band would be said to be ripping off the sound of the previous band they were a part of.
Garbage quality music would have to be created to meet contractual obligations of the music companies.
And the "Classic Lineup" that many refer to of Styx, really should not be called Styx because Curjelewski left after Equinox - thus ending the band.
I am just of the opinion that if you don't like what music the band is making then don't buy it or don't go to the concerts. Support the albums you like by buying their albums. There are many bands that i used to listen to but don't any more because their music went in a direction I wasn't happy with. If a lineup change alters the direction of music I don't want, then I won't support them. But I don't feel the need to continually trash them either. I just move on.