DC is soon to pass North Dakota, maybe in the 2020s sometime, which is a long way off from a likely necessary 1.15k.
That depends on the price of oil over the next decade. ND has grown more quickly than DC when oil is high. On the average this decade ND has grown at 1.6% per year which is only slightly less than DC at 2.0% per year. At these rates DC will only overtake ND close to 2050, which is also about when it would catch DE.
A substantial part of the growth had to do with the newness of the industry both in location and technology. It takes more people to build an infrastructure and takeaway capacity than it does to maintain it. Yes there are still some pipelines and natural gas processing facilities to be built, but ND is nearing the end of the infrastructure cycle. Also, fracking technology has gotten much more efficient and requires less manpower than it did 5 years ago. At some point, production may hit a wall as the easiest wells play out and more manpower may or may not be needed, but I would expect that employment in energy in ND has probably peaked.
ND does derive revenue from energy production, whether they can or will utilize the revenue stream to develop and diversify the economy overall is an open question.
