Why do fans think that a band should be fixed in time and that they all should just stop playing if the band line up changes?
I saw the Four Tops and Temptations at Wembley Arena and it was a great night, in spite of there being only one original member in each band. And the Commodores without Lionel Ritchie is still a band worth going to see.
Little Feat, Pink Floyd, Genesis and many more carried on after loosing a leading band member and reinvented themselves. IMO those 3 bands are just as good as the bands they evolved from. Dave Gilmour has been touring and playing Comfortable Numb. Does that make him a tribute act?
The opinions of the band quite rightly outweighs the opinions of the fans. If a band carries on after line up changes and remains a good band then there is no problem.