ATC, you suggest that states will nationalise; possibly, but to do what, what need.
No country can pay out for 'nothing'; thus for what value - people, skill, economy. What is the relative cost / effectiveness of airlines vs railways, or different areas of manufacture, what will be the new economic future - existence to begin with, manufacturing, trade, but trade what with whom, then transport - plane or 'sail'.
The 'green card', individual adaptation, new norms, communication, travel, leisure. Food, well being, security.
Very difficult, 'big call' situation; no simple answer, if any. Thus be flexible be prepared to adapt, individual, operator, country.
fox niner, no return to the past, only an uncertain future.