I suspect it will slide some planned deliveries to the right as operators try and wring a year or two out of their existing fleet before spending the dough in replacement airframes.
The big thing, though, will be which manufacturer does deals. Nobody (except one or two I can think of) pays "retail" for their aeroplanes, so the difference between the list price of the Max and the Neo is in most cases irrelevant.
If Boeing does better deals than Airbus then the price differential will change. That said Boeing and Airbus have a slightly different approach to pricing and at the end of the day it is whole of life costs that make the difference - purchase price is just one factor, as is fuel. Spares, heavy maintenance cycles - just one heavy maintenance visit extra when compared to another type can swing the cost balance, add on's as technology shifts etc can significantly change the cost profile of one type of airframe vs another.
Interesting times though as it would be a gutsy move to decide that fuel isn't going to return back to the higher levels it most recently was and base your refleeting decisions on that assumption.