I think you're clutching at straws. 90% of scientific papers are published in English anyway, plus the study never said it excluded non-English papers. And the figures show that
America dominates the most cited papers - it shows England, Canada and Australia doing fairly well but not really better than non-English-speaking countries. Sure you could remove some bias if you really tried... But we could also look at other metrics such as, say, what investors put their money in: like how the iShares ETF based on the S&P Global Technology Index concentrates a massive 77% of its holdings on US companies
http://us.ishares.com/product_info/fund/overview/IXN.htm . Or basically just pay attention to the breakthroughs that get reported by the press: top ten discoveries of the decade,
http://news.discovery.com/human/discoveries-of-the-decade.ht..., almost all American researchers; best inventions of the decade,
http://www.inventhelp.com/Newsletter/2009_12/time-magazine-b... , mostly american companies; or look at pharmaceutical companies by country
http://en.wikipedia.org/wiki/Category:Pharmaceutical_compani... ; I mean I'm just picking the first such articles that pop up. You'll probably say that these are biased to Americans... but really, if you just pay attention to what gets reported in something like New Scientist (British publication) you'll see how much America contributes.
Plus, the counter points that people cite tend to be lone inventors who either left their home nation to set up shop in the US (or UK when it was the leader), or whose inventions/discoveries were not capitalised upon. Whereas America is full of not just great research, but the rise of entire industries that other nations can then participate in.