My guess would be no, due to several reasons:

The "MAX" has been out just for a relatively short time, and while a few hundred airplanes seem to be a lot, there always exists some kind of reserve (recently taken out of service aircrafts that are still at a normal airport, wetlease) and even cancelling a few flights here and there would be cheaper than reactivating any desert bird.

Plus, most aircrafts brought there were shortly before next heavy maintenance, thus it would take quite some money and time to bring them back into service.

Unless the grounding would be for an extended period of time (ie, over 3 months - entirely possible) I can't see this happening.