But would anyone bet Beer on her theory?  I wouldn't.  There are too many vectors at decent magnitudes in favor of renewables while those against the fossil fuels are building.  Coal is the leading edge of the demise as was whale oil in the late 1800's.  There is a Brit paper out arguing for fossil fuel demise in a decade.  Probably optimistic but no one saw the exponential rise of solar installation that has occurred either.  Practical, cheap storage would push fossil fuels off the cliff.  And with the intellectual horse power focused on that aspect it's only a matter of time and not decades of it.