The talk of closed btc loops is crazy. It shouldn't matter at all if you buy something with btc if the recipient cashes out immediately or not. If there is enough demand for bitcoins it won't hurt the price, if it drops the price then it means the price was too high.

The Canadian dollar is a strong world currency, sometimes at par with usd, sometimes above, sometimes below. Could you imagine if we had to keep Canadian dollars to keep the value high? We wouldn't have any electronics whatsoever. We wouldn't really have anything.

If trading our Canadian dollars for usd in order to buy pretty much anything caused the price of cad to plummet, we wouldn't have a cad dollar anymore.

We can trade back and forth between cad and other currencies because cad is known as a strong, stable currency and therefore there is always people ready to buy when there are people selling.

The closed loop idea is crazy, look at Argentina.