The market price of bitcoin is determined by the number of bitcoin holders who think they will go down in value; as coins gradually transfer to the hands of people who believe they hold long term promise, the market price of 'loose change' available for transfer will rise; that rise in price will actually _increase_ the use of btc as a transfer mechanism because it will attract more people seeing BTC as a store of value, which increases the store of bitcoins held for long term positions and thus the market price of BTC, etc. The increase of its usage as a medium of transfer ALSO increases the market price of BTC; that interplay between new value-minded long term investors and new users of btc as a transfer mechanism is what has been pushing the price up continually. the entrance and exit of speculators in the market is a short term distraction that has the benefit of spreading awareness but the drawback of adding to conception as a bubble.
after about the 6th or 7th one of these 'boom and bust' cycles that triples/quadruples the market price, people will stop seeing this as a 'maybe' thing, and my guess is that will drive a massive one-time spike in the value.
This sounds backwards to me. If I think the value will increase, I'm not going to transfer them to you at today's price. So this will decrease the amount of transactions, making it less and less useful as a transfer mechanism. Which is exactly what people say is the problem with deflationary currencies.
If you do spend dollars, you don't lose anything by converting them to bitcoins just before spending them.
those 'unproductive' people holding incredibly valuable bitcoins will enable bitcoin to work as a dirt cheap payment processing system.