I don't think USA CFA will lose its value greatly, even though a CFA-holder will find it more difficult to find a job in USA.
Many students cancelled their study plan in USA, not because CFA is losing its value, but because they believe that it will be difficult to find a finance job in USA after they finish their studying there. As far as I know, USA work experience is part of the reason many students want to go USA.
BTW, how do you define "如果美国经济崩溃了"? The crisis has been under control now. The problem is that how soon the economy can back to its growth track......
