I'm not sure an airline owes anything to any city (outside of any contractual obligations there might be) ... Las Vegas, Orlando, San Diego, Hawaii, etc have gone through this before and will again.

They are all generally pretty good at giving out incentives to keep at least a base level of people coming in to keep the city afloat until things pick up again. Also with the US dollar what it is, I would assume they are making an effort in non-US markets to bring people in.