I honestly believe that this is already happening, due to following facts:

1) mtgox has monopoly on trades
2) mtgox uses a chart that seems to make price rises more favorable (at most 1month past is viewable)
3) there is no regulatory authority, control algorithm to highlight suspicious trading aimed at inflating the value artificially (companies like avalon and BFL could have the Funds and Hashpower to dictate the price of the system by flooding the market with high prices and small trades would follow suit
"If he is charging xxx$ why should I charge less" )

could burst the bubble before it even takes a real grip on the world economy.