After Mayor Bloomberg‘s swift removal of Schools Chancellor Cathie Black, could lightning-rod Transportation Commissioner Janette Sadik-Khan be next? Amid the growing uproar over bike lanes and the decision to drop her plan for a 34th Street pedestrian mall, some City Hall insiders are whispering that Sadik-Khan may be pushed out. One insider noted that she’s been trying to make nice with her detractors. Bloomberg’s spokesperson denied it, telling us: “The commissioner has the mayor’s full support. He backs her 100 percent.” A DOT rep said, “The commissioner is enthusiastic about continuing the work of making New York’s safe streets even safer.”