In comparison to getting your wallet compromised by viruses searching for it (and they will probably become more aggressive and adept as BTC usage increases), the chance of this happening I feel is exceedingly low. And avenues of recourse exist: there are clear leads to follow on for an investigative team.
> I've had my bank ATM card cloned by a skimmer on an ATM while I was traveling overseas
I know that my credit card covers me for this and I would get my money back if such a thing were to happen to me.
> I've had WU give me ridiculously unfavorable exchange rates, and there was nothing I could do about it
And BTC transaction fees are ever-increasing. And so is its environmental cost.
My grandma lives in .pk. I fear she would not be capable of understanding the concept of BTC or Trezor as she can barely understand how a TV remote works. She does very much grok the concept of cash money though, and is quite fond of exercising her freedom with it.