
"The price has been pretty stable for the last six months."
But in a non-transparent market and potentially illiquid market it is at risk of massive volatility. And that could come from any one of a number of causes:
Crims decide that Bitcoin transactions don't give anonymity in an NSA world
Big institutions find Bitcoins not worth the work after compliance and capital reserve needs
Somebody comes up with a better way of mining coins, and supply expands
etc
Bitcoin will remain a boom and bust economy whilst it remains part of the shadow financial system.