[plaguuuuuu]

It will probably crash. Obviously it has had greater accessibility and hype lately. Coupled with profitable mining becoming impossible for most people riding the boom looks more and more attractive. At some point in the future the buying volume will taper off due to less new speculators getting into the game.

If BTC had anything actually underpinning its value we could work out the ratio of how overvalued it is. Unfortunately it doesn't - even the fact that real transactions are made with BTC doesn't change anything, as the value is so elastic that a T-shirt selling for 1 BTC 6 months ago would sell for a fraction of the BTC now.

If the currency is stable now, what exactly is making it stable? Where does the equilibrium come from? Isn't it unstable by definition anyway since it's rising uncontrollably?

[mrb]

"Coupled with profitable mining becoming impossible"

Well it is incorrect to state that. Obviously, as the exchange rate increases, mining becomes more and more profitable. In fact, as of today ($50/BTC, difficulty factor around 4.9M, 25BTC/block) mining has never been so profitable in over a year(!) since January 2011 ($6/BTC, diff=1.1M, 50BTC/block)!