Personally, I have no interest in any sort of reunion of Queensryche and Geoff Tate unless it was with DeGarmo. If it is just Geoff, that doesn't really excite me as a fan. Been there, done that more times than I can count.
While I am not AS high on Queensryche with La Torre as some are, the fact of the matter is, I think most fans are pleased with the new music (those that aren't on the "no Tate, no QR" bandwagon). The self-titled album and Condition Human are much better than D2C, and much better than anything Tate has made outside of Queensryche.
That said, however, I don't personally feel any of that matters to Queensryche. What matters is the almighty dollar, in my opinion. And if promoters come calling, offering decent money for performing Operation: MIndcrime in 2018 with Tate reunited with Queensryche, and the amount is sizeable enough, I think it'll happen.
But again, the amount has to be big enough. What always seems to be clear with Queensryche in the post-CDG years is -- if the money is there, they will do it. When they tapped La Torre to replace Tate, it was amid declining revenue, and watching their bottom line get smaller and smaller because of the payroll and other factors. So, they wiped that clean, got La Torre, and tried to get everything as maxed out as they could on profit.
My gut feeling is that they are coming to another fork in the road. The guarantees are likely getting smaller (they are for many bands, not just Queensryche), and it is getting tougher and tough to book a profitable tour (which is why they do all these fly-in casino gigs and such -- they pay well, and don't cost much to get there and back).
So, again I say, IF the offers and guarantees from the promoters are there, I would bet Tate and QR would reunite for it, to make that money. Will it happen? I have no idea. I think it depends on the following factors:
1. The right amount of guaranteed money and shows from promoters
2. The right agreement between Tate and the band principals (Jackson, Wilton, Rockenfield)
3. How it would impact the relationship between La Torre and the band (assuming this would be a temporary thing if indeed the possibility came up).
As I said earlier, I'm not personally interested in it, if it indeed came up. But if the offers come in, I'd bet they'd jump on it in a heartbeat.