Ok, I guess I should change my vote. My wife asked me if she could get the android market, and I took the rooting plunge. My first attempt almost ended in disaster and frustration, but my second attempt (on a different computer) worked without issue.
I rooted, installed the Market, installed an alternate launcher from the Amazon App Store (Go Launcher was removed, but Claystone was there), signed in to google, and promptly unrooted.
Everything is running fine, and she is sticking with the default KF launcher, and only switching over to Claystone for Market access.