I'll throw another idea out there. There have been a lot of advancements in "just in time" manufacturing, and no one likes to stock inventory, so what about a major manufacturer developing a "build a rifle" option:
Choose you action (micro, short, long, or magnum) and caliber
Choose your stock (style, material, LOP)
Choose your trigger (conventional, two stage, set)
Choose barrel (length, contour, material, threading, twist)
Choose extras (engraving, hinged floor vs magazine, rails, etc...)
Seems to me that you could design the components (e.g. single stage trigger and two stage trigger) to fill the same footprint so that final assembly would proceed the same for all rifles regardless of which components the customer chooses.
If a major manufacturer did this how much more expensive would the rifle be? Certainly the guy who wants a bolt action Grendel with a 12.5" LOP wooden monte carlo stock, hinged floor plate, two stage trigger, and 28" stainless barrel would happily pay a few hundred dollars over the standard offerings.
Maybe the big guys have thought about this and it's too cost prohibitive, certainly you lose some economy of scale if you can't hammer forge barrels and order 10,000 copies of a single stock design.