I am afraid, it will though -- look at the two major dump sites :) in social media calling themselves Facebook and Twitter and the kind of garbage that's on there...
Sheer volume, these days, means lower quality (sad but true because of general writing ability and levels of education in today's mass-media influenced society).
No need to despair though -- because this can mostly be solved by better search tools for Steemit. "Simple" as that...
I am aware of asksteem and similar tools. I am also aware of search being a whole different matter with blockindex-stored content here. All I'm saying is that users need to use all the Steemit search tools available or in the process of being added in order to blank out the low-quality content and find what you really want to read. Then the low-quality posts will automatically receive fewer votes and will be siphoned out and ultimately go away.