Hi Matt, and welcome,
Just a few things, and I'm sure others will be along to make comments as well.
To take your dog (any dog) out twice a month for long, grueling hikes, you of course will have to invest a lot of time in keeping the dog conditioned to be able to handle those kinds of hikes. Weekend warriors become injured warriors, regardless of the species

.
I watched part of that video, and that dog is well trained, but you should realize that what that dog is doing is basically a game for the dog. The dog is having a blast, as it should be when it gets to bite. That's the basis of most protection sports; it's all a game to the dog. To assume that all dogs who have that kind of training would be able to take the fight to a real life attacker, and "protect" you, would be a big gamble. That's not to say that you can't train your dog to be a deterrent, and intimidating, but in general, it's not likely that most dogs would truly be able to stand up under a real attacker. (Check a thread on here called Ummm, I think...this whole topic is dicussed.)
If you are out in the world with a well-trained and obedient dog that looks like a police K-9, as DSs do, then that is likely enough to convince opportunists to look elsewhere for a mark. If you plan to live in some third world country where you truly need this kind of protction, perhaps you'd be better served investing in some good guns. I'm serious. Most people don't live in situations that require a dog to protect them. Besides, do you want your dog going up against a gun or knife?
As far as a dog being able to handle being kenneled occasionally, that is in part a training issue, and that applies to any breed.
Can DSs be good family members? Yes. That's also a training issue (or a lot of them

), as long as you get a pup that has the temperament to be developed into a good family member.
It's great that you're doing a thorough job of research long before you get your pup!