Sure it can. But it won't. Bitcoin is pretty much unusable for day-to-day practice, too slow, too complicated. There are many more exciting projects which are getting hard into everyday shoppings like dgb for example. It's amazing for me how btc is going further and further but it won't become a global currency. I think that something else is going to be created in the future, something based on cryptocurrencies, related to it, but not BTC. Cryptocurrencies are just a transition moment in the evolution of modern, financial world. Well, we'll see soon :>