No clue. It will be no short years to balance it out and looks like decades.
We may see one day a fee for mileage and it doesn't matter where you drive. There been talks about going this route. If you drive 10,000 km a year or 60,000, the fee rate is the same, but the bill will be either low or high depending on how much you drive. If the fee happens, that will be the end to my 8,000+ yearly holiday driving.
Driving is the only option for me based on where I want to go, as you can't do the side trip from X mode of travel or when you want to do it in NA compare to Europe.