while bank wallet is a really great thing for fast checking out in shops or online shops
Not all people use bitcoin to send or receive payments. The number of people is very small comparing to number of people that use banks.
I think to use both of them, bitcoin mostly if you use it more often and bank for rare transaction. Sure as you expect bitcoin wallet will come to normal groceries as well.
Bitcoins is best when it comes to online transfers as it involves very less fees and credits are too fast in compare to banks and that is the reason people prefer it.