not sure are you talking about buying products or only buying bitcoin. for buying products with bitcoin is an good idea , if some shops allows bitcoin to buy product directly from wallet or bitcoin debit card is good thing for the bitcoin industry . i seen on this forum some threads mentions about bitcoin debit card and buying products on shop

.
He is talking about bitcoin buy and sell with fiat currency.Like in London have a shop where you can buy or sell bitcoin with pounds similarly as in Shanghai you can buy or sell bitcoin with Yuan.I would be great if every big cities have a shop like this.people will be most encourage to use bitcoin.
Do these shops provide any other services? Buying/selling BTC only doesn't sound like a robust business model.
It would be perfect if all the 'money shops' (where you can exchange currency, cash cheques, sometimes buy/sell gold etc) started trading BTC. Seems like a natural choice. Could work well especially at the airports where there's potentially a lot of people with some foreign currency cash left-overs which they could use to buy small amounts of bitcoins out of curiosity.
I think it will be a good idea besides many people nowadays using bitcoin. We need to go with the flow of our society. Today many people have accounts of bitcoins. If bitcoins will legally accepted in shops in cities they will be able to use their coins for buying their needs without bringing some money to them. They only need internet and phones. And it will make them hassle free because of easy and fast transaction in paying the things you buy even in internet. Bitcoin has a high value so if some shops accept it, I think their profit will double and sometimes quadruple. This bitcoin idea is good to us so we must accept it and use it in a good way. Goodluck Guys!