Back in 2007 when I was looking for a job, SWA was definitely a place I would work for. Now as a 5-year FO at DAL, heck no! I like that I can see all corners of the world and the USA that you just can not and will not be able to do at SWA. And I've jumpseated enough on 737s to know that I hate 737s. It is Boeing's worst cockpit (ergonomics, space, and noise).
If I was a FO at SWA facing a 18 year upgrade (assuming no backward movement), I would be looking at everyone (DAL, UAL, FDX, UPS, ALASKA). When the dust settles at UAL, there's going to be massive retirements. DAL will have them but they're going to take longer to kick in.