There are a few potential options for oneworld in my opinion....and they are as follows for the following reasons

Asia (including China)
I still firmly believe that AIR CHINA could possibly defect from Star to oneworld, especially given the close links with CX. I mean, if MU and FM merger does go ahead...this could mean these two airlines could be part of Star, allowing CA to join oneworld.

CX does have a close relationship with MH.....and AF seems to be against MH joining oneworld from what I have heard. We could possibly see MH join oneworld??

Middle East/India
For India, I am starting to believe you are more likely to see IT join oneworld as opposed to 9W as they joined the oneworld explorer airfare. But I think one or the other will join oneworld eventually. After all, 9W has developed a close relationship with airlines such as QF

GF could be a potential inclusion. First, they are a member of the global explorer airfare. Second, former RJ CEO Samer Majali is now the head of GF.....so it might be easy for GF to join oneworld.

Alternatively, EY may be a strong possibility given the new established relationships with both QF and AA

Africa....
I don't mean to sounds ignorant, but from what I have seen, African Airlines are either scary....or aligned to Star and Skyteam. What is left for oneworld in Africa? Air Zimbabwe?? Libyan Airlines?? TunisAir and Royal Air Maroc are more likely to join Skyteam given the French link??

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Now, in a Utopian world where I had ultimate power, I would like to see SQ, SR, EK and 9W join oneworld....I shall keep dreaming.