There is already an absurd amount of literary content freely created online by millions of people. And most of the sites offer some ranking system to filter the crap out. I think I bought my last book ever in college, considering I have an infinite supply of 15 - 25 year old Tolkein's works available that they put out for free because they just want people to enjoy their writings if I look hard enough.
I've acquired about five self-published books at a very low cost (including free) and they've all been shit. I have a hard time buying something these days that I don't think had an editor work through it, but I am concerned that editors will play a smaller and smaller role in the book business going forward.