Fair enough, it makes sense. I don't know if there are enough huge Martin era fans to sell out a concert, but if they want to have a profitable tour, the reunion with the original members is the only way. I don't wanna blame the guys, it's the money we're talking about. But still, for all the fans, what matters is hearing those good old songs, even if we try to forget who will be sitting on a drum stool.
I'm personally not too happy about the situation, but what can you do. It's still Ozzy, Tony and Geezer.