Quitting? Hmm.
Truth to tell I really don't know why anyone with less than 10 years would stay at US. Unless. Unless you really like the lifestyle, and that's the rub isn't it? The job kind of ruins you for a daily 8-5 grind doesn't it? Still, there are many factors at work. Airline pilot and flight attendant jobs are not easy to get. Your best evidence is Mr. Parker's statement, despite US' crummy reputation, apparently there are about a thousand people a month who would love the chance to be quick called at 1am to be paid $30, because oops, it's cancelled and you got out of bed to make a 2 hour minimum.
Right now also may not be the best time. If you turn on NPR or listen to the news, the major topic of conversation is the either "in progress" or "looming" recession in the United States. You can expect all hiring to contract, and money to seize up. Also, if Delta and NWA do actually decide to dance, there may be furloughs from either or both of them, as they get synergistic. Hence, more people who are addicted to jet fuel out and available for that $30.
Here's my humble opinion: go to school. Check the latest labor stats and choose training in something that people will always need. There are a bunch of associate degree programs that get you qualified in jobs that pay considerably more than US, humble as they may seem. Try to pick something flexible that you can combine with flying and then you'll never have to worry about what US does. You can enjoy the flying and forget the rest. Your goal should be to be their worst nightmare come CHAOS. A flight attendant with an alternate income.