Why change the GBs at all ? They match the history of the game , the newest GBs get stronger and harder to get and life goes on. Were you upset that your dealership didn't give you a new car after ten years as a free upgrade ?
But that's not necessarily true. There are some very early GBs, like the Zeus and CdM that are very powerful even when you get to later ages, but other GBs that have come out in later ages - like the Virgo and Flying Island that are fairly useless. But the point of changing them is more to make them relevant again, not individual GBs, but GBs as a whole, when compared to Event buildings, and now Cultural Settlement, GBG and QI buildings. Anyways, INNO just posted this today - so it sounds like they are working on this already - hooray!
"In addition to these features, we're focusing on
improving the Great Buildings to ensure they remain competitive with Event Buildings. We won't overhaul the system entirely, but we are committed to making more buildings relevant."
Which is basically all I was asking for when I started this post. And whether they do this by shrinking them or changing them in some other manner, I'm fine with it either way. I just thought shrinking would be something easy for them to do, but there would be several ways for them to fix this, and I'm fine with any, as long as they do something!