"Tough' question? Yeah, that's a real "gotcha!"
First, most Regionals are in a training bubble right now. PSA and Mesa in particular but also a few others. Their staffing situation has nothing to do with an inability to hire. They are hiring just fine and filling classes.
Second, when the 50 seaters are parked those pilots will be re-allocated to larger RJ flying. It is what Parker has done with Republic. Don't be so naive to think that wasn't in the plans for a while because it was. Those pilots are now available to fly the larger RJs....and you will see the same thing happening at all the other Regionals.
In short, they do have the pilots and will continue to do so. AA can replace Eagle's flying and they do have options. You have been swayed by the loud talking heads into believing that you can never be replaced by anybody. You have been swayed into believing that this is all just one big bluff on AA's part. It isn't.
If in light of all that your attitude is still to "shut this place down anyway!" then by all means: resign. Take your badge and manuals into the CP's office tomorrow and be on your way. Otherwise you are just playing the mental masturbation game.
This TA is a tremendous win for us and will provide the kind of career progression pilots at other Regionals can only dream of. Have you even seen what the TA has?
		
		
	 
Yes I have thoroughly read through the TA and also studied the history of this sort of thing at not only Eagle, but other regionals. I have spoken to the company, further up than you will ever know. I have spoken to my reps and senior Captains alike.  Career progression? You speak of the "Amazing" flow? We have a flow that is supposed to be 50% of AA new hire classes right now. Is that happening? Nope. The company used a clause to meter down to 20 per month.  When the final contract language came out for this current AIP/TA, similar "Gotchas" were in that language.  The company realizes they won't be able to hire enough to staff all the planes and states they will park airplanes to keep the flow going. So they are going to park shiny new airplanes to keep the flow going? Yeah. Right.
Going back in history, why did the flow fail before? Was it 9/11 or the fact AA bought another airline and didn't need as many pilots? Which happened first?
So this amazing career progression can very quickly be complete crap.
Industry leading? Other regionals have flows now. Do you think they will all just surrender to Eagle and say "Oh wow Eagle is getting the few pilots out there because of their flow! What will we do now?" Yeah. Right.  With close to 20k pilots retiring from big tin jobs in the next 10 years, why do we need a flow anyway? You are not one of those negotiating committee guys that failed a ton of training at Eagle and said the flow is your only chance are you?  Truth be told, the flow is a way for AA to control the movement of their pilots; most could "flow" to something bigger before they would flow to AA at this point. History will soon show this.
Back to the cornerstone of your argument. Pilot shortage. I agree that PSA and MESA are in a training bubble.  I also agree they are getting a good amount of pilots.  However, I have some inside info for you: How many of these new hires are not retreads?  PSA is getting a ton of Silver Airways guys and MESA and SKW have been robbing the coffers of Great Mistakes.  A small percentage of new hires are traditional guys coming from CFI type jobs.  The largest flight school in the nation is producing a small fraction of what it once did. About 1/3rd, a little more than that, aren't even going regional. There are many great corporate gigs out there that pay very well these days.   That same flight school did an analysis of what it would take to build a 1500 hour pilot, actually for demonstration purposes, it looked at what it would take to build 200 1500 pilots in terms of time and resources.  I was in a room during one of these presentations. The results are jaw dropping. Suffice to say,  nothing can save the regionals as they exist today except higher pay to attract those unwilling to work in the profession for that reason. I have some analysis on that too and I was also amazed at the percentage of pilots, from one school, that have walked away from the airlines, and in many cases, flying altogether.
Your arguments are missing out on the simple math: 20k pilots slots open above is in 10 years. New pilot "pipelines" longer and thinner than before. This why a place like RAH hired 400 pilots last year but only grew by about 30.  You think PSA and MESA will be able to keep their growth going?