It’s hard out there for new Broadway musicals. Of the two that have opened so far this season, one, the atrocious, $22.5 million “Queen of Versailles” starring Kristin Chenoweth , has already gotten the guillotine. And of the last 48 new Broadway musicals, just four have recouped their investment. That’s 8.3%. Sheesh. Not much is sticking around for long, and this week “Moulin Rouge!” announced it will close this summer after seven years at the Al Hirschfeld Theatre. “Hell’s Kitchen,” at the