Disclaimer: I didn't read the article. I'm just drawing from what others have said.
The idea that an AHL franchise relies on Joe Hockey Fan to carry their attendance numbers is wrong. There isn't a minor league team in any sport that actively markets to a fan of the sport. That person is already coming to games. It's the family of four, the corporate outings, the youth groups or scout troops or whatever that they reach out to. The idea that attendance will go up if a development team is closer to its affiliates fan base is just wrong. Being on staff of a minor league baseball team, nearly all of our "marketing" is targeted at being a family friendly source of entertainment that will appeal to any interest, rather than hey come watch baseball! Competition isn't just other sporting events, but the shopping mall, movie theater, going out to eat, etc.
Now, that all said, it is incredibly beneficial from the hockey ops side of things to have them either close by or accessible, hence why Milwaukee/Nashville or a Bakersfield/Edmonton works. Regardless of where those NHL teams are playing, they can get a player anywhere in the country in a matter of hours. We're a Texas Rangers affiliate, and its a great relationship we have being 45 minutes from them.
Moving minor league teams closer to parent clubs is a trend in both the NHL and MLB for certain reasons, but from what I'm gathering from others' responses, not the reasons this articles lists.