....As long as bitcoin is assured to rise in value as the number of users rises, the current holders have no incentive to use it. But of course then there won't be any decent transactional volume. The game being played with the conversion value right now isn't going to get people to use it if that is what the game players actually believe. This current behavior is demonstrating that bitcoin is not and probably never will be a generally accepted currency with a reasonably stable purchasing power. In addition, it's structure ensures that it must remain so.
This is wrong. The major holders of bitcoin all talk about it's transaction use, not it's use as an investment. Most of them advise against that. And I'm afraid you still don't comprehend the application of fungability to a digital currency in transaction.
To get there, take some sample international flows and rates, velocities, and figure how much bitcoin it would take to handle those.
For 200m transactions per month at $20 average, each transaction taking 30 minutes to 6 block chain verifications. Assume some inefficiency, so one unit of ecurrency is in use 750 cycles each month. Needful thing: 266,667 units of ecurrency to fulfill the task.
Using a price of $1000 per bitcoin, 5333 bitcoins are required for this flow. With 12M bitcoins in circulation, this wouldn't even cause a hiccup in the price.
Where fungability enters in is in considering that it does not matter whether the required amount of bitcoin based on conversion rates is 5333, or 533 or 53,333. With 12M bitcoins would this 200m/month transaction volume be affected if the BTC price went to 1/1000 of what it is currently? To $1/bitcoin? Answer: this would require 5,333,000 bitcoins or nearly half the existing currency base. Obviously, that would cause a supply demand issue that would cause the price to rise.
Thus, ultimately, transaction volume should be the major driver in bitcoin valuation. Note the impact of velocity on the above equation. If some smart guys reduced velocity from 30 minutes/transaction (which I extended to about an hour for inefficiencies) to 1 minute, they could really make out. And this is possible.
This is the general method that should be used to guess at future bitcoin valuation. Note that the 200m/month transaction rate I chose for illustrative purposes, it is actually ridiculously low. We're talking about the whole world here.