We also have Mirages..... Old pilots of the birds could fly it, without having to step in one, we have their skills and their experience.
That still would be hard, there are ways to block that link, no matter how encrypted, satellites can be brought down too, unfortunately; now you're contacting what you said earlier "4. Those would be still vulnerable to the Link/communication Jamming, Spoofing, Hacking by the enemy."
I can't seem to understand your stance.
The General Atomics Avenger and the Taranis are examples of large and fast drones
http://www.forbes.com/sites/paulrod...ersonic-stealth-drone-takes-off/#2a8ce86c335a.
The thing is, if we keep counting on the risk of these things, and not bother developing then we aren't getting anywhere.