Today is not a new normal -- we are viewing the upside-down-parabola crisis curve from its very nadir -- so there are not going to be permanent infrastructural changes made on the basis of today's realities.
In any event airline economics say it would be less ruinous to just park the planes than to hike prices astronomically and cap LFs at 40%. When it's $3,000 to fly cross-country the 40% LF will be moot because you'd never get enough takers. Very good news for Greyhound though.