Just quoting a professor who seems to know what he is talking about. It is thought and projected that “easily accessible Nat Gas” will tail off in 40 years.
You tube, Illinois EnergyProf.
This a good presentation.
https://www.youtube.com/watch?v=31Bi2LpLoK8
This is the general link... lots of good stuff including nuclear (the failures and disasters of nuclear power), what is fracking, etc.
Yes, demand can increase because the "easily accessible" keeps increasing faster.
That professor keeps talking about "easily accessible", which is always expanding. What we frack today was not "easily accessible" 20 years ago.
The supply is hundreds of years....even if we keep expanding our use.
The industry disagrees with your professor.