Just wouldn't work. Clubs would still find a way of removing managers, but it would then be along the 'gross misconduct' lines. It would in fact probably result in a lot more messy and protracted divorces.
I was talking about this on Twitter and some Rotherham fan replied saying he has been getting Rotherham to play some exciting football recently.
I think although he is a decent manager in the lower leagues, it would be a huge gamble for Wednesday to take to appoint someone who has never managed...