IDK about your theory regarding "pocket change?" Will coinage become more valuable at some point? I think it will generally go along with the value of the metals contained within the coins. Nickel may be decent. But, the "constitutional coins" (coins with some silver content) have not only held their value, but gone along with the price of the silver weight contained therein. It would be nice to think that dimes made out of... what? zinc, tin? will become more valuable or useful some day, but I doubt it - for some reason. Much better to actually go with the real silver bullion rounds and coins for future money & use as true, valuable currency.
Naturally, I think gold and silver coins are more valuable than common coinage... My theory isn't based on the metal content of the coinage, just as the Fiat Debt Notes aren't based on their Paper value... Being that gold and silver will become way too valuable to circulate as money, I doubt that will ever see that again... Not as a common medium of exchange... Sure, you'll be able to turn it into Pocket Change and the New Debt Free Dollars... That's a given... Thanks for your comment... Pocket Change...