For comparison, the fastest train is 2h 25m. I guess you need to travel to and from the train station too, but it's definitely more central (2x15 min) and you can easily hop on train even five minutes before the departure - although I usually plan at least another 15 min buffer. That is a total of a little over 3 hours.
I don't pretend to know enough about economy of future trains vs future electric flights, but it looks like short distances will always be a tough sell for airplanes. Personally I also find trains more comfortable and I was never given a free massage for carrying scissors in my pocket when boarding one.