Have you ever tried to buy a car belonging to her recently passed away husband from a little old lady in Salina, Kansas with "cash" while her apparently inbred yet highly paranoid relatives supervise the transaction?  Let me tell you, it's not fun negotiating what type of check and guarantees she will accept let alone getting them in the middle of Outer Mongolia, 400 miles from home.

If (and this is still if) bitcoins were mainstream enough for her and her relatives to know it's an irreversible, secure transaction I could make from my phone and they could verify in 10 minutes I'd have had that 67 Bronco without two dozen new grey hairs.