You guys worry far too much about people using BTC to buy goods.
If people aren't buying goods and services with it, it's not a currency. It's only a pyramid scheme.
People are not buying goods and services with gold, ergo gold it is a pyramid scheme too. So what?
You cannot send gold over the internet though, so bitcoins has more potential to become a currency for goods and services.
they used to, though, when it wasn't hoarded.