I like that you have an alternative perspective on the matter. Until I got the end where you plugged Dogecoin... A blockchain that creates 10,000 new coins per minute! How is that a solution to fiat?
Also, I think it's pretty narrow-minded to to look at cryptos as mainly a credit card for immediate transactions. The block chain has so many potential uses that we haven't even imagined yet, no sense in trying to put it in a neat little box as primarily a currency. I think we will see a coin that becomes the daily transaction coin as each token/coin find their place in a respective eco-system, one will emerge as the ideal coin for transactions, I've not really looked into Lite coin, Z-cash or Monero, If anyone is knowledgeable on these, how do you think they could fair as currency replacements?