Russians are pragmatists for the most part. If it ain't broke, why fix it?
The 7.62X54R is to them what the 308 is to NA shooters. A standard that is hard to change despite the many 'better' options.
Unfortunately, Russian firearm tech is usually looked upon as crude and second rate despite the fact that they do very well in certain disciplines.
NA shooters have decided that a rimmed cartridge cannot be a modern cartridge so why bother offering a rifle for that. I see that they also make a 308 version. I am sure that would get a bit more interest.
As more target shooters discover the benefits of certain Russian rifles, the interest IS growing for their stuff. Will always be small vs the domestic stuff.
The Moisin Nagant can be made into a very nice shooting rig. The mag system runs surprisingly smoothly and the trigger can be tuned to a very nice pull.
I have seen modified MN's used in major sniper shoots in E. Europe. There certainly is no fear that the action will not work when dirty
Within the performance of the 7.62R cartridge, works just fine.
Also, reports show that ammo made specifically for accuracy from E. block countries shoot very very well. Stuff we just don't see on this side of the pond.
Jerry