First, as background, Strib user comments are generally beyond Crazytown, more so than other news sites.
I read the article and didn't see much of a point beyond warped civic pride. I really don't care how the airport ranks against others worldwide, nationally, or in the Delta world. I just want to get where I want to go in a timely stress free manner, MSP still works well for that. The move to RJ flying is not limited to DL or MSP.
I am getting the feeling that the author has recently taken a Jetblue flight and drank the Koolaid. That is the only "low fare carrier" not operating at MSP that I could see someone wanting. People don't seek out Spirit do they?