I'd suggest he should have quit his job, made his disclosures and stayed put. Look at the three people in the linked interview - while it's undisputed that they've suffered great disruptions to their careers and lives in general, all three are free men, giving interviews to a national US newspaper. Edward Snowden is a fugitive in some strange limbo largely of his own making which he appears, inexplicably, quite blithely set on making worse.
As to the drone strikes, I was replying to the other commenter who seemed to think drone strikes or some sort or intervention by the US military is a realistic risk Snowden faces. I'd put 'covert CIA assassination' in the same bucket and I don't really know how to put this politely but this is, in my mind, tinfoilhattery.
He's facing a big fat criminal indictment - there are probably people at the DOJ working on it who didn't get to go home this weekend after he started talking about entirely unrelated (to his civil liberties claims) details of US intelligence operations. There's probably nothing the US government would like more than to see him tried on criminal charges in open, civilian court - it's a slam dunk of a case, by this point. There's nothing whatsoever to be gained by killing him.
Once indicted, I think kidnapping is at least a plausible concern - there are documented cases of US Marshals pursuing people wanted by the US courts overseas - with varying degrees of success and with or without the cooperation of local authorities. I can even think of a couple of cases pre-war-on-terror military interventions as part of efforts to apprehend wanted persons. The Achille Lauro hijackers come to mind - and even they, while being actual terrorists and actual murderers, ended up being prosecuted in Italy and serving time in Italian prisons. But again, Snowden could have trivially avoided this entire line of unpleasant possibilities by simply not getting on a plane to Hong Kong.