I hope with slot added for FIFA World Cup 2026 :Canada/Mexico/United States give chance for ASEAN national team get chance participants there and have one or two years time preparing for qualifier stage, I sure between Indonesia, Thailand or Vietnam have opportunity will be success on qualifier group stage.
The weakest zone without a doubt it South Asia. We have a bunch of countries that are all ranked below 100 as per FIFA. And the fun fact is that this zone has a population of 2 billion, and has one of the most rapid population growth rates for any part of the globe. In Asia, the football strongholds are the middle-eastern countries (including Iran) and East Asia (Japan and South Korea). Australia is more like an outlier which has shown enormous growth over the years. And then we have Central Asia (especially Uzbekistan) which has also shown significant improvement.
I haven't seen much of Uzbekistan yet. I can't even remember whether I saw them play ever, but yes there is a whole different part of the world developing and may soon be participating in major soccer events. It is unexpected that China is so low in the ranking. Usually they are sports focused and they have also been buying European top players for a lot of money since quite a while ago. Also a fun fact is that the women's national soccer team from China was one of the best in the world for a very long time, the men's national soccer team only managed to qualify once for the World Cup final round in the entire history. Who would have thought that?