It's catching; cryptos. Interestingly they are more real than fiat currency for the most part inflation is very limited (not talking about you Ripple). And being decentralized market forces are better able to set value. For day to day groceries, and garage sales nothing would beat gold or silver. However nothing beats having a 'wallet in the sky' when you're traveling. Plus you can and should put your cryptocash in a wallet off exchange...no matter how full this wallet it will fit nicely in your pocket.