After eschewing a national tour and opening in a special theatre in Las Vegas, Avenue Q was expected to usher in a new generation of theatre in the desert. But after only five months, and selling only 65 percent of its tickets, the show is closing. “The short-lived run of “Avenue Q” in Las Vegas will probably give pause to many Broadway producers who have seen long-running blockbusters and newly minted hits alike head to the desert chasing seemingly no-lose propositions.”