OK. Alaska is real money for Disney and we know the Wonder is really the only ship they have that can get through the canal. The new ones don't seem to be getting any smaller.
Royal Caribbean does Alaska and they don't have any ships sailing through the panama canal. They have three ships in Alaska. Radiance, Ovation and Explorer.
Ovation goes to Asia, sailing Hong Kong, Okinawa, Vietnam.
Explorer goes to Europe, south pacific and they even have one called the spice route (Singapore, Malaysia, India and UAE). Also the Suez Canal and Athens Greece.
Radiance goes to Australia, but also does Hawaii.
What it looks like they do is head West instead of East when they leave Alaska. On Sept 7, 2018, I found Ovation leaving Vancouver for a 10 day Hawaii (Maui, Hilo, Kona, Kuwai, Honolulu from $1450/person).
Explorer has this epic 21 night leaving Seattle that goes to Sydney. Talk about bucket list!
Leaves Seattle, WA
Five days at Sea arriving in Honolulu
Maui
Seven more days at Sea, crossing the International Dateline and arriving in Fiji
One day of cruising, then arriving in Vanuatu
Mystery Island
New Caledonia
Two days of cruising arriving in Sydney Australia.
Disney has a lot of options with these additional ships without sailing through the canal.