People tend to overestimate the effectiveness of these aerial assets. The real high tech things like JSTARS do wonderous things but they are extremely expensive so there will never be very many of them. And they can't see through mountains.
The other platforms that use night or day vision cameras don't really see that much. The field of view isn't that big, relative to the size of the area you want to cover. They can be heard from the ground, which can be an advantage and a disadvantage. The bigger ones like the Predators cost more than you think and they require a surprising amount of manpower to operate. Aviation Week quoted a figure of about 120 people per Pred when everyone is included. They are much more affected by weather than a manned aircraft.
The drones are a great tool, but you will never have enough of them to provide the degree of overwatch you suggest, especially if there are a multitude of small units roaming the field.
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