I think It wouldn't be a bad thing if bitcoins were used in big cities. It would be fun to have the opportunity to use bitcoins to pay at retail stores.
of course it wouldnt be a bad idea, in my opinion it would allow a lot of people to use bitcoins so the adoption would be way faster
yes and this would help for mass adoption for people which don't know bitcoin. sooner or later, with bitcoins in every big cities, can make people learn about bitcoin and finally bitcoin will become famous in those big cities.
You can take horse to the river but you cannot force him to drink the water, if I have never heard about bitcoins and I see shops accepting bitcoin and if I have credit card and fiat for shopping, I will not bother what the hell is bitcoin.