I hadn't read this article, but all of the news about Wright and Goddard came out last week. I don't agree with most of what the article here is implying through heavy editorializing.
Ant-Man needed a script overhaul because it was originally conceived before the first Iron Man film. Edger Wright simply waited too long to pull the trigger. Of course he can't make the film he wanted to make nearly a decade ago, the entire MCU has been shaped since then and his film is no linger applicable/relevant. Marvel has a consistent universe to maintain, and a random Ant-Man film that doesn't have any ties to the MCU would be laughably out of place in 2015.
Let's be honest, no one was going to see Ant-Man because they like the character. They were going because they were fans of Edgar Wright. Will that impact ticket sales? Maybe. But now the Ant-Man film that we get will appeal to folks who are invested in the MCU, and I imagine that's a much bigger audience.