Those with scheduled max flights, are you re-booking to a non-max flight or just playing luck of the draw hoping they switch your plane?

I have 4 people booked from SMF to PHX next Saturday first flight in the AM. It appears this first Saturday flight is the only SMF to PHX on the max as the rest of the day are all 737-700 or 800s.I could move back 2 hours but would prefer not to if theres a good chance they'll just give us another plane. Really wouldn't want to move back and end up in some kind of cancel spiral if they decide to take one of the other flights planes as the day goes on. Flight is marked as sold out so I'd assume they would try to run it but who knows. Also don't want to get to the airport in the morning and have everyone else already have changed and be stuck with no flights.