I live in an extremely entrepreneurial place, with tons of brick and mortar retail shops. I simply don't see a path for adoption at the Point-of-Sale, unless through something like Strike or Square which handles fiat also.
I do see a huge opportunity to grow bitcoin adoption generally; create more bitcoiners. Who will then utilize the BTC function in their square terminal, perhaps offering a discount to do so. "Peer to peer" payments does not necessarily mean "business to consumer". Many people have an antagonistic relationship with commerce in general and aren't looking to explore its nature.