Let's say hypothetically that Hubski grows by a large factor. Wouldn't this system become a huge burden to users as trolls and children start spamming links and memes with no way for other users to "downvote" junk material?
You can Ignore, Mute or Hush a user. Ignore: Their content will never make your feed. You don't have to see their posts. Mute: They will not see your content in their feeds and even if they did, they cannot comment on your posts Hush: Anyone you hush's comments automatically filter to the bottom of any comment feed. What's cool is that this curates your experience with this user. However, in the same feed where you have a user hushed, they may be at the top of someone else's version of that comment thread. There's no doubt that we will continue to have new functions and features etc as we need them, but this is where we find ourselves now. If you stick around, you will find that we are constantly adding new functionality, much of which is suggested directly from the community.
I can see possibly needing to adjust the rate at which points get added, but think about upvotes for a minute. How often are non-obvious spam and meme posts really downvoted on Reddit? Why do you think so many subreddits have gone the self post only route? I think it's an interesting choice to create a rule in a community that discourages posting links on a link aggregation site. I honestly think reddit has grown beyond itself and the scope of what it was designed to do. I still like reddit, and I frequent it a lot. I just think it has a few issues because of its organic growth.