Until a program can develop a way to create an emotional connection with the text, computer programmed solutions will always be inferior to a skilled content writer. Perfect grammar, spelling, etc. all mean nothing, if you are unable to convey the writing emotionally. Why do I say this? Because our ultimate goal is marketing. And sales are created generally, as emotional responses to one of two primal states = To gain pleasure, or to avoid pain.
But, I will play devil's advocate here. Just because the article is written by a human, doesn't mean they're automatically worth a shit. When a program/bot/formula is able to spin words and keep the "concept" of the article while providing the perfect grammar and article structuring, etc., most of us content writers will be fucked. This will leave only the fucking word wizards to compete..
If you are thinking some of the available content writing is expensive now, you're in need of an ice bucket challenge. When we reach the previously described scenario, the cost of these literary magicians will be charging by kidneys, hearts, livers, or possibly human sacrificing for payments. Until then, you might as well get your content while the going's good, or hope you're dead or have found another method for making money when it reaches that point.