Our opinions notwithstanding, Union thoughts on the matter are little more than posturing for negotiations.
Bingo! UA ALPA states they are not opposed to a merger. They are just opposed to any merger that doesn't improve pilot careers and job security. Translation: A merger with US will cost you (US/UA mgmt.) BIG BUCKS. A merger with CO, not so much. UA AFA is basically the same. Union statements made public, for now at least, are posturing for negotiation purposes only.
One poster suggested a three way with CO. Pieces of US and UA go to CO and what remains becomes the new UA. Anything is possible and it's only speculation at this point. Of Course this assumes the NYT article to be accurate and their are actually merger negotiations going on.