I didn't read though all of them, and I'm not saying that China won't do well, but this list is crap.
1. What was their predictions of the US back in 98?
2. One "prominent" economist. So only one thinks so? No others? And who is the unnamed person? Why is he unnamed?
A lot of that list is little more than fiscal fortunetelling or inconsequential crap "85 percent of all artificial Christmas trees are made in China" bordering on the non-sequitur. There's also crap like "In 2009, the United States ranked dead last of the 40 nations examined by the Information Technology & Innovation Foundation when it came to 'change' in 'global innovation-based competitiveness' over the previous ten years". This of course explains why all but one major tech company is a US company (IBM, Microsoft, HP, Cisco, Google, etc.) and web sites (Google, Facebook, Amazon, etc.)
That list is largely crap for fear mongers and people that like to jerk off the thought of the USA no longer being a superpower.