No key is in escrow for easy policing (Score 2)

I may be completely off base here but wouldn't that restrict all public-private key encryption used for key exchange (unless every user registered every public/private key they used with a government agency first - which seems insecure/impractical). As regards to the future (15-20 years time) does Quantum encryption (for Quantum decryption and thus encryption will come to pass) sufferer from Man In The Middle attacks? If not I see no way the CIA/ Secret Service/ (Insert Government Agency / Media Outlet here) can gain the ability to police packet contents and allow secure e-commerce.