Broadway’s “The Producers” will keep its top ticket price at $100, rather than raise them when Nathan Lane and Matthew Broderick return to the show. “Speculation that people would hold off buying tickets to “The Producers” until Lane and Broderick were back has turned out to be unfounded. That is largely because the show is playing to tourists, who have no choice but to see “The Producers” now, while they’re in town. As for what will happen to the show after Lane and Broderick leave in March, that’s a big subject of debate on Broadway right now. Some think the show will go over the cliff.”