Re: What would happen if Assange stepped out ?
European countries have extradited plenty of murder suspects to the US. They have to give a legal undertaking that they won't seek the death penalty, in order for that to happen. Their own courts would enforce that agreement, and if they should break it, no European country would legally be able to extradite on any potential capital crime again. He's just not worth it.
I suggested espionage, because I think he can get out of most lesser charges by claiming to be a journalist. The US have much stronger legal protections for this than the UK do.
Were he in Sweden, I believe he'd be safe from espionage, as it's a political offence the Swedes won't extradite for.