While the ship may remain in Asia long term, Disney is known for moving ships to different ports over the years. So it is not unreasonable to think that the Adventure could move at some point to a Japanese port, for example, where it might be more convenient for Canadian and United States passengers to sail. I don’t believe it will happen any time soon but eventually it will, just as ships that sailed the Caribbean moved to the UK and Mediterranean markets and were replaced at the Caribbean ports with other ships. Moving ships around every so often keeps the product fresh without investing additional capital.
As far as my opinion of the Adventure, I like it. For a cruise to nowhere I would like the option of having an inward facing balcony for people watching while I relax. I am looking forward to reading and watching more reviews.