I think for a stable price for 2 years, the actual price level is too low, or to high, as some already have pointed out. If Bitcoin's adoption grows, the price should rise.
But if it fails to do so, or a real competitor is about to emerge, then probably many "holders" will cash out and price should be lower.
Bitcoin is a deflationary, constantly artificially limited currency. It moves rapidly when compared to most financial systems, and because of this the value is basically forced to rise constantly to make up for the limits being imposed. The price will nearly never be stagnant because of the community, the investors, the speculation and said limits.
There will be lulls in the value, yes, but those have only 4-year spreads and a lot can happen in between those 4 years.