It's a bit early to tell if it's a resurgence, so far everything is in the planning phase. Travelling by train in extra comfort sounds nice, but that is only if you don't have frequent stops and you don't have to switch trains in the middle of the night. Solutions like this one look like they'll be very expensive. It would be interesting to put the whole cabin on movable parts and use control theory to keep the cabin steady at all times. To remove the repetitive train track sounds for extra luxury. I hope they succeed.
Actually the Talgo trainsets I mentioned in another comment are apparently very quiet (only one axle per car) and steady running (their special setup counteracts the tendency of conventional carriages to swing from side to side https://en.wikipedia.org/wiki/Hunting_oscillation) - so Deutsche Bahn was on to something when they ordered these for use as night trains. Unfortunately I never got to travel with one while they were still in use.
