I would agree with such a proposal, but I doubt seriously that it is a realistic political possibility, I certainly agree with your proposition that a consumption tax is by far the simplest and least inefficient way to stimulate alternative sources. However imagine for a moment the howls that will rise up for accompanying government programs to minimize the impact of the increase on favored constituents. (notwithstanding the fact that reducing the impact is precisely counter to the desirred effect of the tax itself.)
Another factor usually omitted from this discussion are the many politically-motivated things we do to increase our dependency on petroleum imports -- resistence to the development of reserves on the North Slope of Alaska and in our coastal waters; restrictions on the construction or expansion of our physical plant for petroleum refining and distriobution, as well as LNG terminal facilities; opposition to the increased use of nuclear power ; etc. The list is a long one.
I don't particularly buy the notion that our dependency on oil imports is any more strategically important than (say) our import of Chinese textiles & DVDs, etc. The truth is that, even if we do reduce our petroleum imports, the reserves in the Middle east will remain a fact of great strategic significance in the coming era of European decline and Indian/Chinese ascent. Finally, our interest in the Mideast is also motivated by other factors: Israel and, more importantly, the future political and economic evolution of the Islamic world after a century's dominance and misrule at the hands primarily of the British and the French.