One day, someone will take a collection of popular songs from the 1990s and turn it into a nostalgia musical.
Update July 2016: I was wondering if this had happened yet. I suppose you could count “American Idiot,” but apparently the album was intended to tell a story, so it’s not quite the same as someone stringing together the hits of ABBA or whoever.
It turns out someone put together a Spice Girls–inspired musical in 2012. It was not well-reviewed and didn’t last very long.