The only way Snowden can win now is to come home and let himself become a martyr.
Even then, I'm not sure he "wins". People have a very, very short attention span. He'd be forgotten before the sentencing was handed down, most likely. From a legal point of view, the case is pretty simple: did you release documents you swore not to release? Yes? Penalty is X years in prison. I don't see much martyrdom there. He won't be killed, he won't be tortured (he may be in solitary, which may be for his own safety more than anything else, whether he's a suicide risk or at risk of being murdered in prison -- just my opinion), so there isn't much to be get all that enraged about (beyond what he's already leaked).
The time would probably be taken to put together some evidence, figure out exactly what was leaked, and how. I'm sure there are many, many things he'd get charged with, so there's a lot of research to get done, and since it's sensitive information, there needs to be a lot of care taken to figure out what was accessed and just as importantly what wasn't accessed.
By then, Kim Kardashian will be working on a divorce or another baby ("South", anyone?), Aaron Hernandez will be up for appeal or something and the public won't will care much about this.
"Solitary confinement is considered to be a form of psychological torture when the period of confinement is longer than a few weeks or is continued indefinitely. Negative psychological effects have been documented, leading one judge in a 2001 suit to rule that 'Solitary confinement units are virtual incubators of psychoses—seeding illness in otherwise healthy inmates and exacerbating illness in those already suffering from mental infirmities.'"
Let me know how that goes.
Fixed that for you. Yes.
I think it is better option to be pain in the ass and be always there like a sore spot distracting the government.
I mean, there's a reason Snowden sought to differentiate his methods from Manning's, even if he had the same overall goal.