Agree, it's one of those things where I'll probably kick myself in a couple of years (or sooner). My wife and I want to live in Minneapolis close to our families. With the merger, I won't have to commute (eventually). I want to fly internationally again at some point, too.
SWA is at the top of the heap right now in pay, etc...but history indicates that they can't stay there forever. Or so I tell myself...

And--very silly reason--I don't want to fly the same airplane for the rest of my career.
I'm sure those reasons sound lame, they would if I was reading them. But I'm at peace with the decision.