I'm curious about the OP's age . . . not that it makes any difference or that I'm being critical . . . but I'm guessing younger?
Go in to any gun shop and see what folks are looking at . . . I have friends who own gun shops and they tell me that it is almost always "older" ones looking at revolvers and "younger" ones looking at semis and plastic. I'm not say that is good or bad . . just an observation.
I can pretty much guarantee that the market for radical changes in revolvers would be limited . . . and probably not worth the time for R & D by mfgs.
Personally . . . while polymers may have their place . . . I don't presently own a revolver that is anything but good old steel. I shoot 38s and most are "vintage". I'm not even a big fan of "extra iron" in such things as "ribs" and "under lugs". A rail? For what? I know very few who are going to be using a revolver for "tactical use". I'm sure some hunters might like 'em to hang a light off of for night-time coon hunting but again - how many would sell?
I own a quantity of handguns - Smiths, Colts, Rugers, etc. I do own a Ruger SR9 semi that is plastic - but it took a lot for me to buy a plastic gun - and yes, it functions fine. I had a LCR . . I traded it off and got a Smith 36 - I just like steel.
I was brought up on SA revolvers and have shot them for 50 years. If I could only have one handgun . . it would be a good steel SAA. They shoot well, are reliable and accurate . . . and they been doing the job since 1873 . . . without the need for plastic, rails, sirens, bells and whistles. All of those things are like "go fasters" that all the kids have to have on their cars so they can impress their friends . . . they don't do anything as far as the function of the car for getting from point A to point B. But then I'm old and crotchety . . . and of the "old school" of "if it ain't broke, don't fix it".