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Solar aircraft at this stage (large, slow) have to stay in the sun, are sensitive to wind, and require periodic maintenance. In principle what you describe is basically the goal; aviation equivalent of a nuclear submarine that can stay in flight for weeks, months, or more.

Yes, that's what Facebook is aiming for with their Aquila project, for example:

https://code.facebook.com/posts/268598690180189

(Except they want to provide wireless internet, not surveillance.)

* they want to provide wireless internet for surveillance.

Facebook's raison d'etre is to surveil you.

Short answer, yes. In practice they would probably switch off with another drone after some period of time (months?) to do a maintenance check.