It's all about supply and demand. The demand just wasn't there. Same holds true for all the ships that use to do the Mexican Riviera out of LA & San Diego. There was just not enough people to fill all the berths, so ships were pulled out of there to go where the demand was higher.
Princess does an occasional Pacific coast cruise while doing a repositioning.
__________________ Travel Agent/Cruise Specialist w/13 yrs exp and 48 Cruises on 11 cruise lines! Favorites: Paul Gauguin - Tahiti: Uniworld River Cruises - Europe; Celebrity Solstice-class ships; Holland America - 12-nights Baltics & Russia; RCCL - 14-nights Greek Isles, Turkey, & Croatia; Holland America - 14-day Alaskan cruisetour; 10-night Canada/New England cruise; 21 days Hawaii w/7-night NCL cruise; Oceania - 25 days in Asia; more than 3 months touring Europe by train. And many all-inclusive resorts!