Apparently it’s not just the middle class that has been wiped out in America. Mid-range booze is on the endangered list now, if the WSJournal story on the owners of a once-dominant vodka is any indication. The stuff has a Goldilocks problem: Not too cheap, not too expensive. Only the top and bottom sell anymore, and the more flavors a distiller adds to its line, the less space bars are willing to allot for a single brand. So maybe something good will come from all the whining Americans are doing these days: an end to 80-proof pop.