That is unlikely. The A320neo family currently has an order backlog of over 6000. The only airline I know that is actually pursuing cancellation is Garuda. Given that the A320neo family is really the only competitor to the 737MAX family airlines don't really have anywhere else to go.
I also doubt customers will really vote with their feet given that the number one factor when booking a ticket is price. If some people choose not to fly on them it will create supply/demand imbalances in the market which would be interesting.