Well, IF it (US+HP) comes to fruition, it could add fuel to the long-smoldering spark between AA and AS. Were this to happen, hopefully AA would learn to regard the West Coast as something other than a colony of sorts. Of course, they could move the SEA hub or the PDX "hub-let" down to SJC and then shut it down in a few years.....
At the very least, AA might try to bring AS into the oneworld orbit in a more official capacity.