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.
__________________ 47 Cruises & Counting! Favorites: Paul Gauguin to Tahiti: Uniworld River Cruises in Europe; any of the Celebrity Solstice-class ships; Holland America for 12-nights in the Baltics & Russia; RCCL for 14-night Greek Isles, Turkey, & Croatia; Holland America for 14-day Alaska cruisetour; 10-night Canada/New England cruise; 21 days in Hawaii including a 7-night NCL cruise; Oceania for 25 days in Asia; & 3 months touring Europe by train. And many days spent in all-inclusive resorts!