Plenty of people at UA live in IAH and commute to SFO for the WB flying out of SFO. Also, IAH is senior on the NBCA side, and current plans for the NB fleet don't have growth in IAH.

If I were in your shoes I'd stay right where you are. You hit the pilot lottery with a job at DL at your age .. settle in and enjoy the ride. 1,500 numbers below you will make a significant difference when (not if) a downturn eventually arrives and either movement stops, downgrades happen, or the F word occurs. (These will all happen at some point in the next 40 years). You've got a great spot ..I would not give it up unless you absolutely positively must live in SFO and don't want to commute. Then, it might make more sense.