2. Drones that you can programme GPS into and they fly themselves are illegal in most countries as you have to have control and line of sight according to the air navigation order. Those that don't come under this are operated by USAF / RAF / A de la air
4. The quads are easy to fly but the orientation issue remains and they are easy to crash. also if the GPS lock is not gained at launch then the GPS is irrelevant
There is a new "breed" of drones that are controlled by a micro-controller, like Arduino or PICaxe. These have built in gyroscope and acceleration, and some even have GPS (and if they don't a GPS unit to install on one costs about £10).
I also know of people who have built quad- and sex-copters programmed entirely by Arduino, with accelerometers, gyroscopes and GPS. In fact there is a well known U-tube channel where you can get all the instructions to make your own out of about £40 worth of kit.
These are very capable of "flying" themselves, and easily programmed by anyone with a PC and the development environment to download the program (the software is free).
I personally know of 2 people who have a drone quadcopter that will fly to and maintain a programmed GPS position.
As for them being illegal. I know of a few people who have untaxed cars here in the UK, as well as some without MOT. Let alone all those cars that have been sold with existing remaining tax on them. Just because it's illegal doesn't mean it doesn't exist.
There are hundreds and hundreds of articles on robotics that explain how to make a self-contained using GPS. If you have a microcontroller controlling a copter, it is a simple thing to add GPS, and many people have already done it. Most of these people are too smart to do something stupid like park it at the end of a runway, but that doesn't mean it's not possible.