For example, December 2015 was US$69.07 on September 14, 2007 (point A in chart 2 ) and is currently US$93.95 (point B). In other words, the expected price of oil in December 2015 has risen by almost US$25 per barrel in the past 2 years.
As you may be aware, oil forward curves have historically not been a good predictor of future prices. Forward curves are a summation of current market expectations. Expectations change over time as new information becomes available.
I don't think that the current forward curve correctly reflects the most probable oil price scenario over the next ten years. However, humility in the face of market expectations and an understanding of those expectations is essential before one can disagree with them.
For an explanation of forward curves, look at Chpt. 18 of Oil 101.