Controlled by Who?
I am pretty sure the NSA, and probably other agencies will continue to do what they want, without effective oversight regardless of what the law says. If challenged they will obfuscate (highly dubious interpretations of the law that they themselves developed sounds exactly like obfuscation).
It's not like any of this data gathering can stop people attempting to explode bombs in subways, so why do they bother?
It might just come down to empire building among the various secret police forces proliferating in the US, after all, even if the programmes might be illegal, they still need a lot of money to keep alive don't they?