The majority of reddit users aren't into intelligent discussions. Everyone tries to deny it, but its true. I will always go on reddit for images and videos. I don't think Hubski will overtake Reddit in this sense, but I do think that Hubski will have a stronger community and more than reddit discussion wise. There is enough room for two, and I personally see them excisting well together.
As of this week, I've started to browse hubski equally as much as reddit. I think they can exist together without stealing each other's user base (like reddit and digg). I don't think it would be a good thing for the majority of reddit's user base to start going on hubski, as you said.
Which is the entirety of hubski.The majority of reddit users aren't into intelligent discussions.