No crystal ball is thick or big enough for making a reliable forecast five years ahead. Some general tendencies I seem to discern - without claiming to be Jeremiah
:
* diesel, or something like it, will need to be available for the sake of road transport; the first fossil fuel to disappear will be AvGas, other variants of gasoline to follow rapidly;
* five years from here, electric may have found solutions to safety issues, so that it can be applied with an acceptable degree of safety for circuit flying/training;
* for cross-country flying, all depends on infrastructure, indeed; and that will depend on state subsidies, and those will not go primarily to private aviation.
My reply to your query would be diesel - and plant a few acres of rapeseed. Except if you foresee to be happy with circling your local church spire, batteries might well develop fast enough for that.