I'm thinking about it, because I've got about 25k in pending purchases, enough to at least hit lower tier on another airline this year.
The problem is that with my current location, AA is the only other real US airline option, and I hate AA. The local alternative, Avianca (AV), currently has too few partnerships to be attractive (maybe that will change).
What that might leave is Flying Blue, although I'm not a big AF fan. Maybe...