Steemit is great and I truly can't wait to see where things will take us.
Right now curating content by up-voting is the only way available for users.
I think you are suggesting we might end up needing some sort of reputation system that helps us pick out posts from "reputable" sources.

I find it kind of ironic than in search for openness and decentralization of trust we end up looking for control.
We as human are not yet ready to "allow for" the exploitation of an automated system (they are kinda inevitable and a subjective thing base on the rules we set).

I'm sure the community will sort things out and the platform will evolve.
We'll just have to wait and see how the steemit team expect to help keep the "website" part of steam usable with a large user base.