Geyser Gulch came along at a point in my life when I was too old to appreciate it. I have been there before, but until I have children, I probably won't use it. However, the notion of taking it out would be as destructive to the children of today as closing the Treehouse or the playground at Tom Sawyer's landing would have been to me when I was young.
I was sad to see that Treehouse & playground go, so I know how the kids of today would feel about GG closing. I might not use it and I think it is "too wet" for SDC, but I think it would be a mistake to close it.