I just realized that I was assuming "drone" to mean "aerial drone". But it's quite plausible that ground-based drones will take off by 2017, which would almost certainly be more visible than UAVs. Self-driving cars alone could plausibly account for this, if we stretch the use of 'drone' (wikipedia explicitly includes semi-autonomy in its drone page). I'll give my estimates for your predictions at 15% for the 2013 prediction and 20% for the 2017 but note that it will be hard to either confirm or deny either of these predictions unless drones are truly prolific or unused.

As a side note, I work on a drone and don't see one every day.