You may well be right, but it's still a pity. I saw Peter Green with the Splinter Group in the early 2000s, and I guess he wasn't at his best, but I enjoyed it and at least I saw him. Similarly I saw Johnny Winter in Leverkusen in 2010 when he could barely make it on to the stage, but he played well, I think, and I'm glad I went. Once they are gone, they are gone.