You are correct; I think when i said 'many' i was more saying '1-3' tens of thousands. Still a huge stretch, but I speak of a scenario where all 'money' gets replaced with cryptocurrency of some form, leading to a huge influx of collectors. If we imagine that a scenario where a few hundred million dollars gets poured into collecting crypto-coins, then its going to be a fact that anything made in 2013/14/15 is going to have notable value, and more so if the coin is well documented with a small mintage and such. There are a relatively small number of pre-2015 coins made, so imagine if alot of money starts fighting over them.
Crypto-currencies are now at almost 55bn market cap. Lets say that eventually increases to a 1 trillion cap, or much more. 100m in the collectible market would not be out of the question. How many coins exist now? I guess you could add it up from my book, but even among 100,000 coins that's $1,000 average per minted coin in collector value.