The good news is that countries don't become superpowers based on public opinion polls. Sorry Belgium, no matter how much chocolate you give away to buy poll votes, it's not going to happen. ahahahahah
The news (good or bad - depends on your POV) is that economically (unless something wildly unexpected happens), indicator after indicator shows China catching up with or exceeding the US and EU. Per-capita lags (yet still is gaining), but total production, total consumption, and GDP are all pointing to China being the #1 economy in the world. When? Depends on how you want to measure it. If it was one simple number, statisticians and political pundits would need to get real jobs. Maybe it's already happened. Check the 3rd set of statistics here:
https://en.wikipedia.org/wiki/List_of_countries_by_GDP_(PPP)
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