It won't be JP kerosene for much longer ... maybe for military aircraft. It will remain because of the ease of storing stove oil in adverse conditions and it's relatively lower flammability and explosive danger. I can't imagine why we would tolerate the hazard of hauling around a big cryo tank...
We probably need a method of concentrating sunlight into producing enough heat evergy that it splits hydrogen and oxygen apart without the intermediate step of generating electricity to do it. That would give us a "portable-fusion-power-to-go" capability.
You could probably make one now if you stored the electrical energy in the form of liquid hydrogen in "thermus bottle" fuel tanks in the aircraft. It would burn like ... blazes.