On the one hand, I can picture how it could be done quite tastefully. They could treat it as a retrospective with a variety of guest singers, and have the, uh, Pepper's Ghostic Dio appear for only a handful of songs introducing each era. That could actually be alright. Have It open the show with Kill the King then have guests sing one or two more Rainbow songs. Have It appear for Sign of the Southern Cross, then back with the guests. On and On and On it goes.
On the other hand, seeing the thing say thanks to the audience didn't sit well with me because of the earnestness RJD conveyed. There was a sincerity with him. He was the most gracious musician I've seen, and it never came across as thanks for the cheque. He was genuinely grateful. This is more of a cash grab, which is exactly the thing that Dio would have hated.