I would argue that even with 3D scanning (which in itself is still not all that advanced at the retail level, have to keep the cost down or the product becomes too pricey) and taking into account all of our "advanced technologies" we have to date there is still a slight margin for fitment refinements. Everyone needs to understand a scan is only as good as the person doing it. If that person doesn't follow all of the proper procedures and the scan is compromised then everything else will be as well.
For example, if the foot is positioned in the wrong pose when scanning, or you may have foot swelling due to inflammation, or other reasons for a variance in the scan, the scan is thereby going to be slightly off. If the scan is off everything else after that is basically compromised. If the proper procedures are followed usually minor alternations and heating of the skates in the store will allow for the necessary changes to bring the product back within spec.
I would venture in the next couple of years we will see specifically made devices that are not using low-level retail hardware + iPad to perform scans. We are very much in what I would consider V1 of this technology at a retail level. Yes, I say retail level often in my reply because everyone needs to understand what a company like SpaceX, Google, Apple, and others may use will be drastically different than what a sporting good manufacturer is going to offer and support without having to substantially penalize the customers pocket.
I am sure this will first happen at the pro level, which is where TRUE, CCM, and Bauer started before it will trickle its way down to the general population.
Lastly, I am not 100% sure I can consider volume ever to be a fitment issue and rather a personal preference. For example, some people myself included) like to get into the smallest and lowest profile skate possible while others ( a few recent customers) may want or need (medically) wiggle room for their toes. Finding that "sweet spot" where you can provide a product for 99% of the general population while keeping costs reasonable is no easy task.