There will definetly come a day when you wont need to. Just this summer over a quarter million stores in Japan began accepting bitcoin.
I can guarantee with that many stores, all your necessities would be covered. Now the issue is, its hard giving up bitcoin for goods in the respect that bitcoin is a commodity with an ever increasing value. It would be interesting to see what happens if a society only uses a currency that increases rather than decreases in value.
It seems that it may stifle purchasing.
It would really be a tough decision specially if you are a person who do think up on the possibilities of the capabilities of bitcoin specially on future aspects.You would really have a doubt anytime you would decide up to buy up goods by using your bitcoin directly since you do know that this coin would potentially give you interest as the time goes by and rather than using your bitcoin you will still use up your local fiat to purchase physical goods.