I'm not sure why you should stick with UA... I would definitely stick with SNA, as I love the airport. There is plenty of non-UA traffic - in fact AA is 2X UA's and WN is even more.
I wish AC brought back their very shortlived YYZ-SNA on a 220... I think that's the perfect aircraft for it - though it needs 6000 ft for MTOW - I don't think it needs close to MTOW to get to YYZ.
There's an AAdmiral's club... it would be a primo market for centurion lounge...