At this stage I'm certain one of three things will happen if the US can get a hold of him: 1) he will be secretly disappeared in a way that gives the US plausi

At this stage I'm certain one of three things will happen if the US can get a hold of him: 1) he will be secretly disappeared in a way that gives the US plausible deniability. 2) he will die in an "accident". 3) he will be taken to trial and put away for life, most likely in solitary confinement ("for his own safety"). It is obvious nobody actually cares about the activities of the NSA and their legality at this point. There has been some bad PR around it but all in all the American public hasn't revolted and the allies are still under control and don't want to risk it. Also, to this day, Snowden is routinely referred to as "a leaker" and US politicians' calls for his death and branding him as a traitor have been met with nary any criticism. At this point it's no longer about what secrets Snowden can reveal, it's just about neutralizing what the US government (as in: politicians and state officials) considers a threat to its interests (as in: their interests, not those of the nation). And to make an example of him, obviously.