Re: What would happen if Assange stepped out ?
"If the US really do want him, they don't have a statute of limitations on espionage - if that were the charge."
Thing is, espionage is a potential capital crime (remember, it was espionage that did in the Rosenbergs), so both the UK and Sweden are under legal obligation to NOT extradite a person to a country where a potential capital crime awaits. So it cannot be done OFFICIALLY.
What Assange keeps claiming is that the US will do it UNOFFICIALLY through Extraordinary Rendition (or simply chuck International Law out the window and stage an "accident").