Depends on your definition of accepted.. I think if you mean mass adoption as a currency I think the answer is no.. I don't think bitcoin or any coin currently is equipped with the needs to compete with everyday purchases like credit cards.. but if you mean as a commodity and available to be purchased trading then the answer is yes.. decentralized exchanges are right around the corner.  I'd say as long as you have internet and some form of digital payment, you will be able to buy and trade bitcoin in 2018.