If you think the infra cost is high for putting a doctor or nurse onboard a vessel, just wait until you see the price tag for tunneling under the Atlantic or Pacific ocean.

BTW, I don’t think anyone here proposed hibernation on an airplane. The hibernation would of course be done on the slow means of transport (train, cargo ship, airship) to get people off airplanes. IOW, it’s a way to get what exactly you’re asking for: a culture that supports ground transport.

The main problem with asking for a culture of train travel across very long distances /today/ is that it’s a very expensive culture (both in time and money). The trains are also a disaster in Europe administratively (different prices for the same train purchased from different vendors, train tickets in Germany unbuyable unless you run their proprietary smart phone app, exclusive discounts only for app users, GDPR-violating cookies, etc). In Belgium even a short 1½—3 hour trip is less than half the price by bus than by train.