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That link you posted had the clinching info
http://www.cmegroup.com/education/files/energy-price-spread-natural-gas-vs-crude-oil-in-the-us.pdf

In BTU terms, $1 of natural gas can obtain 200,000 units of
energy (at a spot rate of $5/million BTU) compared to $1 of
WTI oil which garners 60,000 units of energy (at a spot rate
of $97/barrel). This is a whopping 330% energy content
price gap – even after the polar vortex and deep freeze
have raised natural gas prices. This massive energy price
gap raises questions about how long it may persist, and our
read of the market consensus appears to measure the time
required to narrow the gap in decades, while our own base
case scenario is that it could happen in just three to five
years.
..................
330% means oil has to go down to the low 30’s @ barrel in order to have comperable btu/price to coal and natural gas.

Or natural gas has to move up in price.

The article goes on to speculate on the direction of prices. The article is all over the place on this point Probably the safest guess as to the direction of prices is held by the options market which currently points to higher natural gas prices and lower oil prices in the next five years.

at this point you’d have to go well duh.