It really depends if the Chinese are "new communists" who want to be government-controlled capitalists or if they are just posing for global acceptance and will return to their "old communist" ways (like North Korea) just as soon as they've cornered our capitalist markets.
Remember the old communist style sheds no tear for starving and killing their own people, forcing them to live minimalist lives while surrendering all control to the party and the state. It will only take one dictator to return China to those days.
The USA has its problems, but I think you greatly underestimate the problems the Chicoms currently have.
Bordering on Danger - A Sino-Indian boundary dispute risks flaring up.
Besides India, the Han Chinese have major problems with the Tibetans and Uighurs as well as recent refugees from Burma.
In their rush to embrace capitalism and industry, the Chicoms have huge problems with air, water and soil pollution.
Corruption is rampant. Lax building code enforcement due to corruption is suspected in their earthquake fatalities. Due to their one child only policy, and their preference for boys, they now have an average of six males for every five females being born for some time now.
As for China's domestic unrest:
And if you listen closely to American environmentalists, how different are their demands from the ones of the old-style communists? Not much as far as I can see.
The progressive left is weaker than ever. With the current economy, their premier issue - global warming/climate change - is dead last out of 20 concerns with respect to issues the voters care about in the USA.
They took Congress in 2006 by moving right on gun control and abortion where needed and promising to be fiscally conservative. They continued that BS in 2008. Now they have lost the moderates and independents that control elections if you check recent public opinion polls. Self identified liberals and progressives are only little more than one fifth of the electorate in the 2006 and 2008 exit polls.
As analyst Charles Cook notes, 84 House Democrats represent districts that were carried either by George W. Bush in 2004 or John McCain in 2008, and 48 of those districts were carried by both Bush and McCain.
As for American voters, one can only hope enough have woken up to wrest control from the Democrat communists in 2010 but the Dems are planning to use vote fraud and manipulating the census to try to keep that from happening.
The Democrat communists want to keep the appearance of a democracy and a workable economy until they have secured their perpetual re-election and, once they do, the happy faces will come off and they will rule like North Koreans.