I was not thinking about the cost for the wallet but more for the cost for the environment.
I don't think using 5 time more energy just to gain few minutes is the best use of limited resources, we are transitioning from a world where resources a considered unlimited to a world where resources are scarce and need to be used appropriately.
So there is a change coming for sure but I expect the change will be more that speed on highways will get lower, few countries are already considering lowering the speed limit on highways.