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This is one of those effects that I am keenly aware of. Personally, I'd love to have an outlet that didn't degrade in quality over time. It's definitely a goal that I have.
On that topic, I am planning on dropping the 'most popular hubs' from the discover page soon, and replacing it with something else. (I actually plan to change that page quite a bit.) I want Hubski's community structure to be dynamic and organic, not centered around a list. If someone's hub is popular, it should be because they attract a lot of followers through their posts and shares, not because they have preferred real estate on the site. It was useful to get things moving, but I think it could become detrimental in time.