The linked article is spot on in pointing out that there is not a clear definition of how much airspace over your property is "yours". As it points out, the best case law has come up with is that airspace of which the property owner can "make beneficial use" is his, nothing more. That's vague enough that most every case will be decided on its own merits, and not a lot of help for those who want clear guidance. As for other jurisdictions' legislation, the FAA pretty clearly has sole jurisdiction of the National Airspace System (NAS). They haven't always followed the process for issuing regulations but, ultimately (when they follow the process), they do have the force of law behind them, and they'll be the final deciders of the rules that apply (subject to court challenge of course).
As for shooting down a drone, the old "ball's in my yard, so it's mine" notion that most of us grew up believing is not legally correct. Here's an excerpt from the AMA's "Model Fliers and Neighbors" paper on that issue, prepared by their attorney.
"On the other hand, the landowner has a duty to the owner of the plane, as well. The landowner cannot keep the landed plane. That would amount to a conversion of the flier's property and the landowner may be compelled to pay the cost of the plane. The landowner may not intentionally damage the plane, as this would be a trespass to the chattel of the flier. The landowner may ask to have it removed by the flier. The landowner may move the craft himself if its location is causing some harm to his enjoyment of his property, or is creating some other risk of harm. If the owner of the plane does not remove it upon request, the landowner may have the plane removed from the property such as one would have an automobile impounded. In any event, the landowner may not deprive the (owner) of his right to the airplane nor may he intentionally or recklessly cause damage to the craft. If the landowner breaches this duty to the owner of the plane, he exposes himself to liability for conversion, trespass to chattel, replevin, and other forms of recovery designed to enable the (owner) to recover the plane or its value."
Of course enforcing the law is another matter ... the cost of forcing a landowner to pay for damages done could well exceed the cost of the damages. If just asking didn't work, a simple letter from an attorney might do the trick. Of course the landowner may have recourse for damages resulting from the aircraft's trespass.
If interested in the legal analysis of trespass and recovery with respect to model aircraft, the AMA document is at
http://www.modelaircraft.org/files/2012 ... orsDOC.pdf