sorry, I have to reference the
trezor everytime I read about this (supposed) problem. It can now be solved with $120.
It's still not an easy solution for the average person. If I handed a trezor to a Regular Joe off the street (or gf, grandma, boss, non-tech colleague, etc.), the first thing he/she would ask is "How do I get bitcoins to and from that thing?". 30 seconds into the explanation what it is, how to even set one up, much less how to use it, and they would have tuned me out already and walked away.
Second thing they would say is, "I have to buy that thing for $120, when a credit card is basically free with my bank account? No thanks."
A trezor may work today for us Bitcoin geeks. But for Regular Joe mass adopters, trezor like devices need to be even easier to set up and use, as well as so ubiquitous that they are basically free devices, given away perhaps by bitcoin wallet services providers like Circle, BitPay, or CB.
It looks like it's even easier to use than a trezor and also cheaper. It communicates via NFC and the same device can be used with a mobile or a vendor terminal. As I see it, the answer to the question "How do I get bitcoins to and from that thing?" would be as simple as "Just tap it to your mobile!". However, it's still in development.