@Robert Gentel,
Sorry...I can't quite grasp what that would actually be like in reality.
Are there sites you could direct us to that would allow me to get a real sense of it?
Off the top of my head, I think I might find that I would possibly miss a lot of responses that turn out to be very interesting (I know I could be wrong through not understanding.)
I use ignore and have become a pretty good ignorer, and so I don't think there would be lots of advantages for me...but I'd like to grasp the idea way better before commenting further.
Edit: Read further, and noticed choice is implicit in what you are thinking about.
I can certainly see that being able to continue a discussion without the sub-conversations that consist entirely of trolls and comments responding to them would be great.