I can't see them shutting Harvey and Syndergaard down and going to a rotation of deGrom, Niese, Colon, and Matz in the playoffs. The fans will crucify them.
If all goes well in the next two weeks and they can manage to get to a 5+ game lead, I still think they should DL Syndergaard with made up shoulder fatigue, replace him with Matz, and give Verrett/Montero a couple spot starts to help limit innings for the others. When Syndergaard comes back from the DL, if they still have a decent lead, you DL Harvey with another phantom condition and repeat the process. Saves both of them like 20 innings so you're not shooting over the limits by like 40 innings in the event of a playoff run.