My wife won't go see him for the same reason - she doesn't want to ruin her memories. While Tate IS singing better (he's probably a step below the high mark he was at during 2005 when QR opened for Priest and did all the old stuff), he's still not great. He has a couple of great moments. And my wife just wants to preserve what she remembers, as opposed to what is. I can completely respect that.
For me, it doesn't bother me AS much, as long as the effort is there to genuinely deliver, and it has been (unlike the latter years of his tenure with QR), and if the performance is an overall decent one. A buddy of mine boiled it down to this - if you go, and you have a good time, isn't that what it's about. When I saw him sing on the acoustic tour in 2017, I had a good time, and that led me to this current tour. I didn't have AS good a time, but it was still fun, and the effort was there. So, if Tate does not reunite with QR, and ends up trotting out Empire in 2020 with a similar band, I'll probably go see it. I'd prefer QR do it with Tate (I dislike La Torre's voice on stuff post-Mindcrime), but if it ends up being Tate and his band, as long as YouTube shows they are playing that material decently, I'd likely go and enjoy it for what it is (cheap entertainment with a smaller crowd).