I like this idea, and they can deliver it to my house. Yeas, their will be a longer wait, but at least you get what you want. Hyundai does the exact opposite and it is a major PITA to get the car you want with the options they say are available. Their dealers are allocated by algorithms that say what sales more in your area. If you want a certain trim in a certain color, you either have to wait, or go to other dealerships that sale more of those cars. which then throws off the algorithms. Totally stupid.
I think if the industry goes to this type of PERSONALIZED sales, the dealerships will still have a few cars on hand for the people who don't care and just 'want a car' and to give the potential customer something to see before buying. Which is how I think it all started in the first place: manager orders a "fully" optioned car for the showroom, then the customer would delete things they didn't want and wait for their car to show up, if they didn't have it on the lot, or just buy the fully optioned one "off the show room floor". That used to be a thing, now they just cram the lots with a few strippers, a few loaded, and a bunch of mediocre.