Re: moving into Asia.
There's also the political element.
For the Island nations, moving into Asia means an even more remote chance of qualification to a major tournament than they have now, but vastly increased cost.
For the Asian nations, even if Asia was split in two, there would be the additional cost of having to travel to places like Honiara to play.
For us, we take on much greater cost for a lesser qualification chance.
There are just so many factors against it that, even though it might be the best thing for us in the long term, it's extremely unlikely