Plenty of people missed out on the 12(6)s, and of course there's been no one new allowed in the "club" for decades. I always take one or two of the little guys with me when I go to the range, and I'm always happy to let guys that can't have the forbidden fruit take a few shots with mine. A buddy of mine, who I regularly shoot with, is the same age as me and got into shooting at the same time. At the time that C-68 was coming, he didn't bother getting himself any guns that were destined to be 12(6), a decision he has kicked himself for ever since.
As the number of licensed 12(6) owners has dwindled over the years through attrition (an entire generation has passed since the classification was created) the values of many of the little guns has dropped. The upside to that is that anyone in the market to expand their 12(6) collection could get some good deals on great little guns. The downside is that owners watched the value of their collections get less and less with each passing year. The handgun freeze has made all that irrelevant now.