He wasn’t stuck : his lawyers would contact the State Department and arrange a surrender. There is also the case of limited validity to return to the US. He chose to apply for asylum still and exiled himself.
I am not making the case one way or the other because https everywhere was beneficial. But he signed up for a security clearance and knew what his obligations were (eg allegiance to the US)
I like to remind those with security clearances, which are really just hyper-NDAs, that the oath to the constitution supercedes any NDAs! Thats true allegiance to the US, which Snowden demonstrated, and very few people have the backbone to be/do.
Between a Rock and a Hard Place is almost the literal definition of stuck.
Yes, I'm using analogies, but I know which of the two I would choose. The US has only gotten worse in it's introversion since, so his choice seems to be increasingly correct - if personal liberty is the priority.