The internet has changed things about as much as anything in history.
Now we're seeing blockchain uses that go well beyond the currencies that are in the news today.
Imagine if every transaction between people. All finance, legal, trading, transportation, records, health, property.. anything in a ledger were secure and private but transparent in a way that couldn't cuts out fraud.
And cheaper by at factor of 10-100x.
Here's Alex Tapscott in a Google Talk, explaining as well as anyone.