It is entirely possible that in the future, we model makers will have 3D printers bought for $79 at a giant box store and which are capable of producing even large parts with unbelievable detail and resolution.
In that world, model kit manufacturers are going to get out of the injection molding business and start selling us digital files of "kits" that we access online and print on our printers.
Assuming your magic 3D printer had virtually unlimited size capacity (within reason)....and let's say you are downloading a file of a Spitfire.
What scale would you make it? We have always been limited to what is available or on offer from a manufacturer, or the traditional scales of 1/72, 1/48, 1/32, 1/24, etc.
What if *you* were the manufacturer? How big or small would you want that "perfect" Spitfire (or other subject) to be?
For something like a single engine WWII fighter, if it's one of your favorites, I think 1/32 is too small. For other subjects that you want to add to the collection but don't need to be the centerpiece, I think 1/32 can often be too big, but with 1/48 too small as a substitute.
I also think 1/35 scale is too small for most armor subjects, and often way too small. For example, a German Kübelwagen or a Willy's Jeep in 1/35 scale is tiny. Tons of interesting subject matter is just too small in 1/35 scale, yet there is no real substitute on offer.
What's your perfect scale? And do you wish you could make the model kits you buy a different scale than what is available?