The first generation Colt Single Action Army was made from 1873 to 1941. They made about 350,000 of them.
You couldn't give them away after WW2. How much is an all original, pristine 1st Gen SAA worth today? Hopefully you're intelligent enough to realize that it is collectible.
Glock sold 350,000 pistols in the whole world (250,000 in the US) between 1983 and 1992. The 2nd Gen came out in 1988, so their are obviously less 1st Gen Glocks than there are Colt 1st Gen SAA's.
Glock Gen 1's today are the equivalent of Colt 1st Gen SAA's in the mid 1900's. They're so common that they're cheap, there's lots of newer, "better" stuff out there. They're beaters and work guns.
Have your grandkids come back 100 years from now and post a new-in-box Gen 1 Glock 17 in the "For Sale" forum (if they're still allowed to own them). There will be so many collectors fighting for it that it will shut down their email.
Same thing has happened to Colt SAA's, 1911's, Garands, M1 Carbines, S&W revolvers, Colt revolvers, Model T Fords, '57 Chevies, etc, etc, etc, just in my lifetime. I have no reason to believe that human nature will change drastically in the next 100 years.