In a way, yes…
Even most professional users are not professional photographers, and even the latter are not all on CF Express yet.
So let's assume that 2/3 of the MacBook Pro sales are professionals, and that of those 10% are photographers, and half of them are already on CF Express… all rather lofty assumptions, and you end up with roughly 3% of users needing CF Express.
Compared to the amount of people who have drones, GoPros etc. and other SD-Card devices it's clear that this is a minority for years to come.