For today, most people are using it for ideological reasons.
Wouldn't say that too quickly. I'm quite confident there's tons of people in Greece who currently wish their savings were in Bitcoin right now, versus in the banks. This is a systemic problem, and will only grow over time. Just wait until Portugal and/or Spain goes.
Hindsight is 20/20. The Greeks needed to get into Bitcoin a couple of years ago. It's too late for them. Bitcoin isn't even close to being ready to replace the currency in even the smallest national economy anyway. I've seen estimates of current Bitcoin users numbering 500k to one million. Imagine 11 million people jumping on the system real quick. Not a pretty picture.