>OP is wrong because bitcoins will eventually slow down massively in production(almost to a halt) and stabilize at that point

Eh, quite the contrary. If this rate of growth continues and production becomes 0, it will not stabilize at all because demand increases yet supply stays constant. Which results in the existing supply getting worth even more. This will make it an hoarded asset even more still not able to function as a currency as fluctuation will still be too drastic.

I was also wondering if - at a future point where bitcoin adoption is more wide spread - could not the entire supply chain be "paid" in a matter of milliseconds? Allowing the prices to fluctuate quite naturally. Should not that be especially less of a problem when one bitcoin might be worth as much as, say, an entire city's internet infrastructure (and thus not even up for speculation anymore) and price fluctuations occur in the range of satoshis? The deflationary nature of the currency, turning private individuals into mini-banks, turning greed on to saving and thus optimizing investments and falling prices for economic value creation - aren't those attractive possibilities for a "bitcoin" dominated global economy?