AA's costs - including labor - have to come down one way or another. Either it will happen through new union contracts, or it will happen by AA following every one of their legacy/network peers into bankruptcy.
The current situation is not sustainable forever. It is for a while, but not forever. AA's union contracts are in many ways uncompetitive with where the market is today - that's just reality. Other airlines masterfully used bankruptcy to exact huge concessions from their union groups, and then translated that into a substantial cost advantage and strategic leverage to reform their business models.
Management has made various stupid decisions and mistakes. They should have offloaded Eagle at the market/credit peak 6-7 years ago. They should have reconfigured and upgraded the international cabins (777/763/752) years ago. They should never have given so much ground at JFK. They should have diverted more precious/scarce capital to replacing the MD80s earlier. All of that is entirely true. But all of those stupid decisions - and many more that we could all identify - plus all of Arpey's now-practically-worthless stock options still don't mitigate the huge direct cost and opportunity cost of AA's structural competitive disadvantage enshrined in some aspects of the union contacts.
AA's competitors - either post-bankruptcy, post-merger, non-union, or some combination thereof - have more freedom and flexibility to rapidly adapt to evolving market conditions, lower costs in competitive markets, and access emerging revenue streams. They have more flexibility to add more and larger regional jets. They have more flexibility to codeshare domestically. They have more flexibility to fly more longhaul flights. They have frozen or dumped most if not all of their defined benefit pensions. They have outsourced far more and laid off thousands more people. Their workforces are, generally speaking, in many areas, more productive on various metrics than AA's.
For better or worse, whether it's right or wrong, AA's competitors enjoy all of the above benefits, and AA is at a huge competitive disadvantage because of it. Thus, in the long run, if AA is to survive, it will have to do the same thing - either with or without bankruptcy. It's unfortunate, but it's inevitable.