I'm at 2 1/2 years since my interview but, to be honest, I wasn't really updating every month after I hit the one year mark. Still kind of irritated at being turned down I think and just didn't have the motivation to do anything but fly my trip and go home, plus had a little one on the way so I was busy.
Updated a lot more regularly about this time last year, then I got the call from AirTran so I stopped updating SWA - for almost half a year. Started updating again this past month, we'll see if it helps.
I don't believe SWA cares anything about you switching companies as long as it's not a lateral move. Why would they hold your personal career and financial goals against you? For instance, I left an RJ CA job to come be a 717 F/O. It's a short-term pay cut, but a long-term investment in a much higher pay scale and a more stable (not dependent on NWA) environment.
I sincerely doubt they'll think that's opportunism or some type of problem. SWA hires at least 1 or 2 guys a month from AirTran, which verifies that it wouldn't cause a problem.
Additionally, while I don't believe switching companies would necessarily *help* you, changing your position from turboprop to jet or from PIC to Check Airman is ALWAYS a good thing. Moving up within your company always looks good on a resume.
Lastly, I wouldn't call LL every single month. That may be a bit overkill. Send a Christmas card, say Hi in the summer months with a postcard on vacation, along with updating every month. Anything else probably gets annoying, she has better things to do than field 10,000 phone calls a month from applicants in the pool.
Of course, since I haven't been hired, all that may be worth exactly SQUAT, but it follows with every single piece of job advice I've ever received and I at least made it *this* far.
Good luck to everyone, and Happy New Year!