There is a trick long used in the arts that should be adopted by both the brilliant composer types and rock groups themselves.
As far as individuals go, they need to seek out the brilliant up and coming talent, giving them the support they need to create truly avaunt-guard material, and then make it better with professional shine and extra elements.
Because Carlos Santana isn’t much of a vocalist, he has long used subcontracted talent which strongly improves what both of them are doing.
This keeps him performing good new music with a shared bill, which is a lot better than retirement.
As far as groups go, they could set up a staggered rotation of members, so that every couple of years one would go, and be replaced with new blood. Eventually all the original members would be gone, and while the new members could still perform the old works, the royalties would go to the old members, encouraging the new members to start creating new material.
“.......encouraging the new members to start creating new material”. Couldn’t agree with you more. Having seen David Bowie’s tours in my past, he inspired me to not be afraid to change myself. Happy birthday David ♫
Sons of Soupy Sales!