In my life bitcoin have replaced the function of money for me in many things. now 20% to 40% of my financial transactions using bitcoin. ranging from paying electricity, water, phone vouchers, electronic items and daily needs. for me bitcoin has replaced real money. bitcoin is the future for me. We ll gonna see this at everywhere in near future.
For usage it's fine. But for profit making it's not fine. Also bitcoin doesn't have the ability to reached all places in the world so it can't replaced fiat even we count for decades or centuries.
If it's good for you then it's fine. Just don't cross the border.