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 
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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..I think it is the retail stores in malls thag he is talking about. It is happening in other big cities then why not with those. I think it will happen or is already happening. Have you tried to stop by there? If you can then you might see some. Please share.