A Miami-based revival of Little Shop of Horrors that had been expected to leap to Broadway this summer has instead been stopped cold by its producers, who say that the production simply isn’t ready for the big-time just yet. The show originated as a surprise off-Broadway hit in the 1980s, and has never run on Broadway. The cancellation marks the second time in as many years that a much-anticipated South Florida-based production has sputtered on its way to Broadway success: last year’s Urban Cowboy made it to New York, but closed almost immediately in the face of withering reviews and public disinterest.