There may be other reasons that WN is pulling out -- my speculation would be that they still don't have CAT II / CAT III qualified crews & aircraft, which greatly simplifies their scheduling & maintenance & dramatically reduces their costs.

Given that SFO is fogged in much of the time, it's probably very difficult for WN to keep the tight turnarounds that they need, especially if they need for the clouds to lift before they can get in.

This was definitely the case when I lived next to SFO a couple of years ago -- UA Sh*ttle was able to get in and out when WN was grounded.

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