OT: Question on the stamps forum about what it will look like in say 20 years (slightly coin related

I just posted a topic in the stamps forum and am now afraid that nobody will look at it, and it might be a week before a response! 
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And I have a huge collection of stamps. Anything post 1900 just as well use it for common postage today.
"Keep your malarkey filter in good operating order" -Walter Breen
Interesting stamps just don't appear much on mail anymore. In each of the past three years I have received exactly one current US commemorative stamp on my incoming mail. Out of sight, out of mind.
Everyone I know that is still an active stamp collector is over 60 years of age.
It's also a warning that there are no guarantees in anything--that coin collections as an investment do carry risk and depend on a sustained level of interest. Still, my hunch is that coins will continue to remain popular, and that rare coins will remain in demand and valuable. A lot of coins are made of gold, which tends to imply a certain amount of value, even if the current rise in the metal were suddenly, against all punditry, to crash and burn.