It could be worse, they could have went with al qaeda
Using China as the big bad guy would have been a little more believable, they've already destroyed the American industrial base - without even needing to fire one shot.
Sooner or later our symbiotic relationship (they produce it and we buy it) is going to come to an end, and as the number one holder of US debt it's just a mater of time before they send a collections agency after old Uncle Sam.
As for Homefront, they may be too busy to make a demo but the least they could do is release some actual footage of the "final version" being played both single player and multiplayer - and not more of those talking head bullshit trailers with quick edits of eye-candy moments.