Will China survive this worldwide recession and still maintain itself as the leading economy, are you hopeful about this?

Well, no one is predicting recession for China or India right now.

Of course.

And now that they're sitting comfy with 800 billion Amero they'll be laughing. (when the dollar dies)

Not sure... initially the analysts in the West were hoping for emerging markets like China to bail out the West, but it doesn't look like it now..

I guess yes. China is the largest country in terms of population. Size of an economy primarily depends on a country's population.

I think i heard in some CNN analysis couple of days ago that the US economy is 4 times bigger than that of China. I cant authenticate this though, so dont quote me but i think i heard it right.

within 15 years i reckon

It very well may be the only sure thing in the world today. The Economy in China is the way it is because its people work for pittance, sell for cheap all over the world and the companies and government do what they can to keep it all.