XBT can be used to buy.. computers and drugs. I believe that's what we've expanded it to now. "and anything any merchant who accepts bitcoin sells" - yep to be sure. Can say the same about eggs. If I could pay my rent in eggs, I'd for sure be buying some chickens.
If it's so wonderful, why hasn't a bank bought into it?
If I live in the UK and get paid in USD, I will be paid into a bank account, the bank can convert it to local currency, update my debit card and I can buy food.
I'm still not seeing why I'd want bitcoin myself.