I don't think I would have the stomach to run. He clearly faces a possible execution if he comes back to the United States, but I think at this point he's garnered enough support from the populous that there would be MASSIVE riots if an execution was passed or even being considered.

Plus, personally, I would rather come back to the U.S. and stand for what I did because (1) South America isn't exactly the most healthy place. (2) The socialist governments are using Snowden to get back at the U.S. and some of the rhetoric the south american officials said upon accepting his request would scare me more than facing a public trial. (3) If it was actually attempting to show the world what the government is doing because its morally wrong part of standing up for what you believe in is looking your enemy in the eye. He's made his point, clearly the rage the world and Americans feel is continuing to grow, festering under the surface. His best chances at survival are actually to come home and face the enemy, than run and get murdered in his sleep or simply disappear.