Lets be real, there will be no shortage. We are talking about the same government that now allows knives and weapons back on planes. And yes, those items can be used as weapons. Even with the protest from Attendants, Pilots and even the public the government is ok with it.
Now lets take that same thought process and apply it to any impending shortage. As soon as the airlines(regionals) whine to the government about how they are unable to move the public, it'll turn into a monetary issue and viola there will be some kind of amendment to the ATP rule. Problem solved! Sad but true...
That and a continues increase in the age rule so crews can fly until their 100 yrs old