To a degree, yes.

But I am thinking along the lines of "further improvement and refinement" just as you say. In addition, I wonder if the future will bring us doubles that have a non-traditional look about them.

Here's another way of looking at it; The worldwide, commercial gun market is IMO constrained by the fact that for all intents and purposes the makers seek to build and sell guns that fit a very narrow "style" or "art form", styles and forms that have been with us for 100 or more years.

One area where "beauty is in the eye of the beholder" expanded the market was in semi-auto, military type guns. I have to wonder if other style forms might change in the future and new options for the gun buyer might exist. If you look at a typical double, you see a very narrow form of style.

What if design forms from other shooting disciplines entered double gun making? What if for example synthetic stocks entered the double gun market. What about a REALLY quick, easy device to regulate the gun? Or new action types, or truly affordable interchangeable barrels, headspace takeup arrangement of some sort to eliminate hinge wear between barrel setups, Biathlon-type stocking, etc, etc, etc,...

This type of change HAS occured in handgun design in my lifetime already and to some degree in bolt-action hunting rifle design but not yet with doubles.

I'm really brainstorming here, but taking a peek outside the box I see wide horizons!