To me, this is one of the biggest problems with adoption--bitcoin doesn't offer much benefit to the typical consumer for mundane transactions.
I'm about to buy a coffee machine on Overstock.com. There's no practical reason that bitcoins are better than what I'm going to do which is put it on my mastercard. And there's a lot of reasons that getting my money into bitcoin in the first place is a giant pain in the ass.
Yeah, there are some potential situations that could change this, and if I lived in a country with massive inflation I might feel differently, but as it stands, I don't see any compelling reason to use bitcoin to make purchases.