With the arrival of high speed trains and low-cost airlines, rich and poor are simply swapping long-distance transport modes.
This is exactly the case. I doubt the return of traditional cheaper trains would change much. They did let you carry your bike onto them which is not the case for most high-speed lines today though. As long as airlines are basically subsidised and we all take for granted that we can go anywhere in the world whenever we want to, the situation has little chance of changing.