Now that we can go far away by air with shorter time and cheaper fare(at least, in Japan), many people would choose airplanes.
Considering that it will be difficult for trains to run faster than airplanes, the only way to survive must be cheaper fare or providing more luxurious room than flight service.
Passenger night trains in Europe: the end of the line? report published
http://www.railwaygazette.com/news/policy/single-view/view/passenger-night-trains-in-europe-the-end-of-the-line-report-published.html