G & S dead and buried? Not in Seattle. I picked up a complete score of The Mikado and The Pirates of Penzance at an AAUW booksale in Brattleboro, VT, while I was back east last month, and am hoping to put the former into Esperanto. (I believe it's been done before, but I can't locate the results.) I've translated portions of Iolanthe and HMS Pinafore in times past. I have at my feet as I type an Esperanto Penzance with two quite distinct versions of "Modern Major General", neither quite satisfactory.
I also use their tunes, e.g. in my "comic oratorio" on Jonah, where one of the songs ("Just Kill Me") is to "Tit-Willow".