At this point, we must stop using Aviation Fuel.
False premise.
1. AAM and the like don't use AVGAS or AVTUR now, neither will they when cheap oil runs out. Solid rocket fuel will continue to be made from alternate organic sources.
2. The same holds true for aircraft. AVTUR does not have to be made from oil or coal, alternate sources such as tar sands, bio-fuel crops or other hydrocarbon sources can be used to manufacture an AVTUR equivalent.
It's not a new technology, it just makes it a bit more expensive.