Looking back at hand tools I have purchased over the last 20-30 years, I would say that the plastic has not held up well. Even some cleaning chemicals slowly take their toll on polymers over time. Maybe there will be a demand for the polymer guns that do survive 50 years from now. I can't say that any new production S&W guns get me excited. I don't feel plastic and gun's are a good marriage.
If we were to go back to 1969 and tell collectors that people would go nuts over AR -15's we would be put in the loony bin. If we were to tell VN vets that they would laugh us out of the place.