This is exactly what I'm trying to tell people since over a year.
It's not bad if you want to save your coins, just when you want to buy something anyway, look if you can get it for BTC, when you can convert the fiat you wanted to spend anyway to BTC and buy you product for BTC. It's one extra step, but this way you help Bitcoin grow step by step.
I disagree.
My example - in light of the increase of Bitcoin price, I can now buy myself a business jet. I want to "help" the Bitcoin economy, so I offer Boeing to pay
BTC. They then go to Gox, open an account, wait for a month or more to get verified. In the mean time, I pay them BTC 125,000 and take the jet. Eventually, some months later, Boeing now able to withdraw fiat, dumps the
BTC to the market, crashing it some 10-30% (my estimate) getting less fiat to what it was worth when they accepted my
BTC payment. I can just imagine the conservative financial director there having a cup of tea with the chairman of the board, saying; "you know what, I thought it was a great idea at the time".
Not going to happen!