When pigs fly.

This "study" of opinion does what exactly?  It certainly has no effect on reality.  No mention of the member countries of this survey...or what six countries believed the U.S. would "remain on top".

I have no idea what this study is supposed to accomplish.

A new Pew Research Center survey of 38,000 people in 39 countries found the widespread belief that China is well on its way.

Overall, a majority or plurality of respondents in only six of the countries surveyed believe the U.S. will remain on top.

"Publics around the world believe the global balance of power is shifting," Pew wrote. "China's economic power is on the rise, and many think it will eventually supplant the United States as the world's dominant superpower."

In both the United States and China, an increasing number of respondents agree with this thesis.