A genuine superpower does not merely have military and political influence, but also must be at the top of the economic, scientific, and cultural pyramids. Thus, the Soviet Union was only a partial superpower, and the most recent genuine superpower before the United States was the British Empire. (http://www.businesspundit.com/why-china-will-be-the-next-superpower/)
To match the US by 2030, China would have to: Have an economy near the size of the US economy. If the US grows by 3.5% a year for the next 25 years, it will be $30 trillion in 2006 dollars by then. Note that this is a modest assumption for the US, given the accelerating nature of economic growth, but also note that world GDP only grows about 4% a year, and this might at most be 5% a year by 2030. China, with an economy of $2.2 trillion in nominal (not PPP) terms, would have to grow at 12% a year for the next 25 years straight to achieve the same size, which is already faster than its current 9-10% rate, if even that can be sustained for so long (no country, let alone a large one, has grown at more than 8% over such a long period). In other words, the progress that the US economy would make from 1945 to 2030 (85 years) would have to be achieved by China in just the 25 years from 2005 to 2030. Even then, this is just the total GDP, not per capita GDP, which would still be merely a fourth of America's. (Brzezinski 1997)
2) Create original consumer brands that are household names everywhere in the world (including in America), such as Coca-Cola, Nike, McDonalds, Citigroup, Xerox, Microsoft, or Google. Europe and Japan have created a few brands in a few select industries, but China currently has none. Observing how many American brand logos have populated billboards and sporting events in developing nations over just the last 15 years, one might argue that US dominance has even increased by this measure.
3) Have a military capable of waging wars anywhere in the globe (even if it does not actually wage any). Part of the opposition that anti-Americans have to the US wars in Afghanistan and Iraq is the envy arising from the US being the only country with the means to invade multiple medium-size countries in other continents and still sustain very few casualties. No other country currently is even near having the ability to project military power with such force and range. Mere nuclear weapons are no substitute for this. The inability of the rest of the world to do anything to halt genocide in Darfur is evidence of how such problems can only get addressed if and when America addresses them. (Fox 1944)
4) Have major universities that are household names, that many of the worlds top students aspire to attend. 17 of the world's top 20 universities are in the ...