I think USAPA has done the correct thing, at least right now, in taking a stance against PBS. It's a negotiating position.
We (USAPA) have it (line bidding); you (Tempe) want it (PBS); then, what are you going to give us for it?
Also, PBS is about jobs. The company is up against minimum fleet count right now, and I don't think USAPA is about to give them any relief whatsoever on that limit. PBS would effectively make staffing more efficient, thus eliminating pilot positions. It's that simple.
The BPR decision is about jobs and it is a negotiating position. To cave on PBS before you go to the table is a huge strategic error.
Maybe PBS is a better way to do things, and even the east pilots would eventually agree (especially if a well designed system was implemented, and not just the cheapest software on the market.) But for now, the position on PBS has to be "NO!"
You can't win at chess if you think you are playing checkers.