really right,standing in front of the merchant's local store about 15 minutes just only to wait the confirmation to be pop up is a really silly thing and people not going to do this unless there's zero confirmation features and we can make a transaction by scanning QRcode,it's different thing and it's fine
I think we do not need to wait 15 minutes for confirmation. Because I think if bitcoin already sent and although still 0 confirmation it was not a problem because it would be received by the store owner. I think bitcoin will not be 0 confirmation as long as there are miners in bitcoin mining. hehe