Meanwhile, The Tor Project today also addressed questions raised by researchers about whether the NSA or U.K.'s spy agency have been able to crack Tor's encryption. "It's not clear what the NSA or GCHQ can or cannot do. It's not clear if they are 'cracking' the various crypto used in Tor, or merely tracking Tor exit relays, Tor relays as a whole, or run their own private Tor network," The Tor Project's Phobos said in a blog post. "What we do know is that if someone can watch the entire Internet all at once, they can watch traffic enter Tor and exit Tor. This likely de-anonymizes the Tor user."
Would’nt the last sentence justify the use of a VPN in the host?