Never said he was unqualified - I said inexperienced and, as a journalist, he is. As a broadcaster, he's certainly paid his dues and gained credibility as a television host through his work on FOX NFL Sunday and LIVE. As a journalist, he has a long way to go and, comparing him right now to his co-anchors isn't a fair comparison.
George Stephanopolous, the former political strategist, put in plenty of years hosting This Week, reporting for ABC News programs and subbing many times on WNT before being named anchor GMA. Robin Roberts, the former sports reporter, spent six years contributing to GMA before being made news reader first then co-anchor 4 years after that.
The point is, George and Robin gained experience and credibility before being put in the anchor position -- Michael has not and there are plenty of people at ABC News - Amy Robach in particular - who are better suited right now for an anchor position. Michael might be one day, but not today.