I'm a fan of crypto currency, but the current solutions don't quite solve this problem -- yet. I'm enthusiastic about what start-ups in the space will bring to the table to fix problems like this.
Second people need to have their wallets on their phones and know how to use it. That's more of a consumer education problem than a tech problem, though.
People say "with growth.. etc.. will be stable." But USD/EUR isn't all that stable and that has massive volume and resources in motion to keep it stable (http://www.fxstreet.com/rates-charts/usdollar-index/) (See 88 -> 74 in 10 months).