Chris would be the deciding factor for me. I'm like Bosk in that I don't want to see Tate anywhere near this band again. Maybe if he was forced to sign some kind of contract that defines limitation on his behaviour. Even after that, I would probably be more interested in seeing them reunite with Chris and retain Todd as the singer. My reasons for feeling this way go beyond the current abilities of either singer. I simply feel that Todd is a much more likable human being. Once you piece that together with the rest of the factors...
From a performance standpoint, Todd would be a better choice at the moment. But like it or not, Tate's presence with DeGarmo is a part of the tour's draw, at least in my opinion. Queensryche isn't big enough anymore to do a big tour, in a big venue, without the original band. I think the last few years proved that. DeGarmo wouldn't make a huge difference to promoters with the current lineup, in my opinion, given how long he's been out of the band. But the entirety of the original lineup -- I do know Livenation was interested in making that happen back in 2010 before the blowup. That was mentioned to me by a band member. So there may be some interest in it again, a few more years down the line, with the album anniversary angle included. Again, all just speculation.
I agree with you about the behavior clause for Tate, however. That, and something in regard to vocal coaching and preparation would be something I would want in the contract to ensure it was as good as it was going to get. Axl Rose did a ton of vocal training before the Not in This Lifetime tour. Tate would need to as well to pull off the kind of set we're talking about here anyway.
Wait, so I just realized something. So now you are actually arguing in favor of a nostalgia tour?? I FEEL LIKE I DON'T EVEN KNOW YOU!
Ha ha ha ha. Well, personally, I'd PREFER that the original lineup reunite and do a full on new album, and a headline tour centered on the performance of Mindcrime in 2018 that featured a first set of that new album and the hits. But I think that's even more unlikely than this whole album anniversary reunion tour.
So I went with the next least likely, but still feasible option.
Honestly, while I am not overly thrilled with the current lineup of Queensryche, most fans are, and they've put out two good records. And at least publicly, they seem to all be united and happy. So if that's the case, then it'd be dumb for Eddie, Scott and Mike to ditch that happiness on any sort of permanent level. But a temporary reunion, to celebrate their past, and put a cap on some things, may be more tolerable, and give them more options moving forward. And, as TAC put, it is a feasible (potentially) cash grab, which Michael, Scott and Eddie probably could use, to help set up retirement, which is looming, I'm sure.