Finding pilots will not be a problem. Waivers will be issued on an as needed basis. If one company is short, the other one will pick up the slack. If the company is using this as a carrot, who would be surprised? No one! And there is no way the 2 companies will ever be merged. Inc. has found more flexibility with 2 seperate units even if one side still operates with low margins.
It doesn't really matter what UAL does. They will order NB aircraft but eill take years to arrive. UAX companies can swap out aircraft as needed to meet ratios. And please don't talk about any serious hiring at UAL being a factor in UAX operations. Those UAL positions they are hiring for now are very risky. Company integration overlap, retirement replacement ratios, basic economics. Just ask the 2007 UAL new hires.
My prediction, look for slow continued regional growth in North American operations, eventually reaching 100 seats. Legacy will continue to operate domestically but will focus on efficient international ops with NB aircraft, (which they are already doing). And legacy retirement replacement will not be 1for 1. The old model no longer works. Position yourself accordingly and make sure your career expectations are realistic and based on what has happened in the last 10 years.