Do you want foreigners to start flocking to US to buy ailing banks? corporations?
PRC has trillion dollar surplus but no motivation for the moment...
Why would they buy US banks when they're transferring their investments into Euro's, not dollars?
And even if they did, if you're a foreigner and you want to buy a US bank? Go for it. I doubt you'll get many U.S. customers though!
Japan went through this in the 1990's. They started off with 91 major banks. When it was all done and said, there were 9 banks left.
We'll survive Chicken MgLittle, don't fret now.