It could attract some casual users. Many people know Bitcoin a bit, but never learned enough to use it. A Bitcoin shop with kind Staff could help.
But will it attract enough people who are willing to use the Bitcoin shop too? Won't using an online shop be the more comfortable solution?
A shop can do both. Online or offline, it should be flexible. And I agree it will attract more casual users. It will also help in propagation of Bitcoin awareness since people will see Bitcoin Banners they used to see only in the internet. More curious people will be attracted and will inquire about Bitcoin thus more possible users will be generated.