Kelgaard, I'd like this shut down right now, I see this assumption in other places, particularly Youtube. Scott's film was given the go ahead BEFORE Blomkamp published his artwork on Twitter, and even then Blomkamp must have know Scott intended to follow up Prometheus as he'd said as much before it was even released back in 2012.
Maybe I wouldn't mind seeing what he could offer in some way, but in the end It was very poor form on Blomkamp's behalf and he only has himself to blame.