Bitcoin as a currency has a great future, to replace every transaction that is actually made by credit cards and bank wires. More and more people are worried by privacy : yeah, who would like that your bank can know that you spend that much money on sex toys ? Bitcoin as a currency has a great future, and this is its anonymity.
Privacy is indeed a growing concern and I think it likely that banks and merchants will respond to an increased concern for customer privacy by offering blockchain-based transactions that hide a transaction's details to all but the customer. Why not?
How the fuck do you want us to get out of our problems if you want to challenge Bitcoin usefulness ?! You know, you are all free to leave if you want to...
I'm not challenging Bitcoin's usefulness and I have no intention of getting out. I'm just pointing out that crashes like the one we are experiencing as I write this clearly will affect bitcoins' use as some sort of world currency. Some will use it as such, but not Joe Dude when he buys a cup of espresso at Starbucks.