1) 95%
2) 80%
3) 90%
4) 50%

probably will happen soon. but china and north korea are still under rule by communists which is slowing them down a bit.
90% on all

Well, Im not sure about all points…BUT

I have a feeling China will start to dominate in the way America has.

And Japan has an influence on the world regarding all the products they make — Sony, Toyota, Mitsubishi, Pilot, Uni-ball, Hitachi, Nintendo….etc.

Um Korea — I was there recently and there living standards is alright. There is no room for normal suburban houses so everyone lives in apartments. Its not such a bad thing. It just depends what you mean by living standards.

Oh and Asia has a strong military power. Majority of the countries have national service - Korea, Taiwan, China etc.
In all, I think China has the greatest army in asia. Not entirely sure tho.

1) 98.3%
2) 83.2%
3) 56.9%
4) 73.1%

By when?

1)China is almost there, so..99%
2)100% because if they decided to stop manufacturing cheap, we'd all be screwed. oh, and the US now owes a couple billion (or was it trillion?) to China.
3)90% Japan's military is weak, but those communists sure know how to stockpile. Luckily, the US has been at it for a while. (Those countries do have more troops and basic training in public schools, so maybe they could kick our asses on the gound.)
4)70% Might not happen to China and Korea. Partly because China has made the stupid mistake to build on its far land, and also farmers are leaving to the city, so now most of their food is shipped in. this could be potentially disastrous if the supply was stopped somehow.

Anyway, how are Australia and New Zealand Western countries when they are just south of the "East?"

Have you even considered India? I think it's chances would be 90%.

This is a really hard question, as East Asia is not nearly as homogenic as the Western nations. Japan has had its prime, China has not seen it yet, the Koreas could not be more different with one Communist country and one Pluralist one, and Mongolia has still to some ways to go.
Still, I'll try:

1. As for total economy, Japan's aging population will contribute to a shrinking of its economy rather than to expand it, while China is tuned in for growth. South Korea will continue to grow still for some years to come, but is likely to drive itself into a Japan-like situation. North Korea and Mongolia will not grow unless something is done about societal reform.

2. Japan is likely to become an cultural influence on the world, just like the US has been for the past 60 years, but its political influence will stay marginal. China will expand both culturally and politically, and so will South Korea too. The North and Mongolia will stay small if their regims will not allow change.

3. Japan's military force has been allowed to expand lately, but its numbers are still insignificant and Japan is very much dependent on the US. South Korea is also in the same position, despite its strong military. China is already a major military player in the world, and will stay there for the years to come. If more democratic reforms are allowed, China's military force will also be allowed to shrink gradually. North Korea's military has been allowed to grow on the expense of other spending, making it a force to be reckoned with, but its significance is small, as they are listenening to their Chinese allies. Mongolia is not, and will not be, a major military player.

4. Living standards will rise the most in North Korea and Mongolia, provided that reforms are allowed. Japan's and South Korea's standards of living can hardly expand any more, making a slight lowering of living standards more likely. China on the other hand still has room to change for the better, which I'm sure they are aiming for.

Generally speaking, the economies and living standards in the West are likely to shrink, as well as living standards and military spending (with the exception of the US).