think of all the services that require a middle person to facilitate some type of trade. the blockchain makes this middle person almost obsolete. through out human history for the past thousands of years, there has always been a middle man taking some type of fee. if you dont believe it, ask yourself or anyone:
How do you send $1 million USD / EUR / YEN to another person in another country without someone taking some type of fee?
that is what the blockchain can do. not just for money, but can be other things as well. Take for example:
https://en.wikipedia.org/wiki/Negotiable_instrument
A negotiable instrument can be digitized onto the blockchain. Currently the nxt platform is working on this called "singleton assets" (
https://goo.gl/SsCpsr). The end game isn't just going to be Bitcoin as the main currency, but a platform to enable digital assets like these to exist without a middle man. It could be ethereum, nxt, or counterparty, but there will be platforms or frameworks for this exact purpose.