I would not like the Q17 to operate on Main Street, because Main Street is quite a headache, which would slow down all Q17's- possibly even worse than Kissena Blvd. The Q44 and Q20 are sufficient enough. Also, eliminating Kissena Blvd service would decrease ridership on the Q17, which would make me happier, but that, with the elimination of the Q34, would cause the Q25 to be filled to the brim with riders, unless there was more service added to that line, which would cause extreme bunching.
By the way, I don't think there should be limited service to Flushing on the Q17 during P.M. rush hours, like the Q27, because that is, weirdly, one of the only times the 17 is almost empty, even on Kissena.