I confess I really don't understand this clamour for an "experienced championship manager". It's a really poor approach.
Firstly, an actual good/proven "experienced championship manager" will not come here. If they are good and proven, they will go elsewhere (to a good/proven championship club for starters.)
Secondly, it's really important to remember that there is lots of evidence that experience does not necessarily equal expertise/skill in any field. This has been shown in lots of areas, and I think is especially the case in football management. SH has discussed this in the past.
Thirdly, in football (as in life)- past managerial success is a not a great predictor of future success.
Lastly, most of the successful managers in the championship this season have been rookies. They certainly weren't proven managers before they joined (let alone proven Championship ones). These being McKenna, Rosenior, Rohl etc.
Let's not confuse poor execution of a sound approach (IF's appointment) with the idea that the approach itself is wrong. Rohl is a great example of the same approach, executed much better.