It's already happening, I know that there are some shops you can shop with your crypto currency, even pundis have lunched their cryptos POS, so it's happening a lot just that it has not attracted mass adaption.
It is happened and many stores are accepting Bitcoin and some other coin for selling their projects but a majority of this community do not know about it at all as these shops do not advertise much. The have to advertise especially on this forum to aware all of them.
Usually the store only develops in certain communities, usually most of the local community is in the coverage of the store. Advertisements are indeed an important factor, in a calculation most stores lack information about the products and services they have. Even if the store makes advertisements that provide information about receiving payments via cryptocurrencies then that will help improve the use of ryptocurrencies much more in daily life.