It will be a while. We have stated some of the reasons, but there are two more to consider. First, just like the Mexican government, many U.S. firms are hedged. The price they face will not fall below $70 in 2015. Second, many U.S. firms are indebted: they need to keep generating cash flow. Ergo.
Plus the other stuff. How long is a while? Make me an offer and I might tell you. ☺
More seriously, if you can figure out a way to go long on oil and have a reasonably low discount rate, then you should do it. The price will rise and rise a lot. But it will not be this year. Nor would I bet on next year, unless you can afford a loss.