I dont think so bitcoin will change everything...because there are other things that bitcoin cannot change...like cashless world,gold investment etc. Bitcoin is profitable but there are also other cryptocurrencies in compare with bitcoin...
There are many other currencies which are competing with bitcoin but every time they fail to stand next to bitcoin, all their efforts and attempts result in vain.
Well as far as the ability of bitcoin is concerned to change the world, it has already brought tremendous changes such as reducing gold investors by large number, changing the mode of investments and also reducing the involvement of banks in international transactions.
Bitcoin provide opportunities to everyone and help each and every of its user and investor from every side. Bitcoin is much better from all the other digital currencies thats why prefer to use it more than any other currency. As it stabilizes the financial conditions of many people, like that it also can provide opportunities to people to change the economy of the world but then it depend on the people that what they would like to do.