Actually, America rose to prominence in the world of science before the Supreme Court imposed the Lemon Test. The idea that we'll fall behind the Chinese, Indians, etc., because of failure to teach evolution as fact, as opposed to theory, seems rather silly.
The Chinese & Indians may be laughing at our educational system, but it's because our system is obsessed with egalitarianism, political correctness, diversity, and other such nonsense, which is mostly brought to us by the same people (ACLU, People for the American Way) who went to court to get those stickers thrown out.
There's a politically incorrect saying among academics in science these days that's whispered at symposiums and alike. It is: American universities exist to transfer scientific knowledge from old Jewish men to young Asians.
At present time we're tearing every level of our educational institutions apart with meaningless debate. This ranges from calls to eliminate public education and/or starve it of funds to idiocy like the sticker controversy and teaching kids about gay guys.
Meanwhile, on the other side of the globe, there are just a whole lot of people who aren't distracted. Americans take their scientific supremacy for granted, just like their took their car manufacturing supremacy for granted.
Science will march on, with or without America in the lead.