I think that chart does not tell anything. By itself it looks like a big thing, but what happens if you enter a second or third keyword that affects more people.

Look what I mean:

http://www.google.com/trends/explore#q=Bitcoin%2C%20gold%2C%20iphone&cmpt=q

Interesting to see this chart! I believe that BTC will become a payment method for many people, so let's see what this chart will do in, say, a year.