I agree that hopping on the managerial-go-round is a great way to waste time and money - but given some of his selections, substitutions, and tactics, questions must be asked.
Are the coaching trio of McKenna/Carrick/Phelan a good fit? (in my mind, no).
I think the Club bringing in, say, Arsene Wenger, to act as an adviser for OGS would be a good start. Give Ole the proper people around him (not coaches who are on their first proper job), and give him a mentor who isn't a leftover from the Glory Days (TM)......then give him till the end of next season, and see how things are.
As I've said before, Ole clearly needs more time but I feel he is clearly the wrong man for the job. But at least give him something to work with.....