Oil is finished after 100+ years of being the main agenda. Just like paper and silver and so many other "essential commodities" for enterprise, this is gong to take a while. Any portfolio should be based on Bitcoin and metals and tend to gravitate more and more towards these two as time goes on. Personally im going to start selling stocks and go on BTC and metals gradually over this decade.
What are you going to use as a substitute for it, I'm sorry? GLTY with Bitcoin...
The substitutive energy for fuel would be hydrogen, and battery which is charged with renewable energy.