Replace airlines with high-speed rail, interstate trucking with cargo rail, urban car use with trolleys, subways and light rail, suburban cars with light rail and buses, rural cars with passenger trains.
The good news is that all those changes can be made with minimal disruptions and the expected schedules and capacities are easily accommodated once the systems are changed over. The other good news is that all those systems can be run on diesel fuel, which was originally a vegetable oil. The alternative supply line should lend increased stability.
The other good news is that all those modalities are inherently more efficient, no matter the energy source used, than what we have now. A two-fer in benefit because many of the engines replaced are gasoline.
I like your perspective on this. But in the real world none of this is going to happen on any scale to mitigate the problem. Firstly how many miles of new railway track has been projected to be built or constructed, say in the past 5 years, how many nuclear plants and how many petrol refineries in the USA. The will might be there, well actually it isn't (it was easier to just go out into the world and secure what was left) but if it (the will to change) was, the current economic constraints for a multi trillion USD investment by anyone (Government or Corporation) just is not available. Basically what you have now will be what you have in 10-20 years time except that there will be very little petroleum available to get soccer mom and dad from suburbia to the centrally located services and transportation hubs (assumming that there currently is a railway station in your town or city).
There is no technological solution for this problem i.e. electric cars will not be available on any form of scale currently with todays internal combustion engined vehicles. Diesel fuel, which was originally a vegetable oil, will be required not for vehicle mobility but to provide calories to stop mass starvation. Anyone who puts vegetable oil into a vehicle for mobility, whilst their neighbours go hungry probably wouldn't be to popular in the neighborhood.
Nuclear power could be an interesting part solution but the amount of energy i.e. fossil fuels required to construct a nuclear power plant would amount to a huge input of short term energy for a moderately long lasting output energy. I will have to find out what the energy payback return would be. The main problem for nuclear energy power stations would be the environmental risks for a society which will have to adjust to a semi-agricultural society. For example the Chernobyl accident laid waste to millions of square miles of land. The fallout from a worst case nuclear power plant scenario could potentially loose the agricultural productivity of a continent for many decades.
One thing is for sure, that is the need for careful management of the peak oil decline. This is the scary part of the problem simply because it will be at odds to the principle of free market economics. Time is quickly running out and the time scale of the decline could be rapid especially considering the state of the financial problems which are ongoing within the western economies. Hopefully it will be soft landing as the years roll back to a state of Auld Dundee. Wooden sailing ships were always more attractive anyway.