Snowden should fear for his life at this point. It's not enough to live in Russia with the weird Bro-ness that Putin and Trump have come to have of late [1]. That means chance for extradition goes up.
Let's say Snowden goes into hiding. What does that mean for a Law and Order type to run the CIA with potentially limited government oversight [2]?
Keep in mind the CIA can kill terrorists who are US Citizens abroad and has been given that permission since Bush 43. [3]
The question then just remains is Snowden a terrorist? It's probably not harder to justify than some might think.
[2]: Senate Select Intelligence Committee on CIA Tortue (point #6 on.) https://goo.gl/dS1pv7