Great points. But the worry is the step up from Championship to PL. It's like ETH from Eredivisie to PL. There are huge differences. PL will eat you alive if you don't have enough experience and quality. ETH underestimate the PL a lot by bringing all his players who are more of Eredivisie standards. His style of play also not suitable for PL.
For Man Utd to appoint a manager, the candidate must be at least have been performing reasonably well in higher level. To me, let him try PL with Ipswich and must perform reasonably well i.e good football, mid table.
The other thing is we are in major transition dealing with big players with big egos. We need a manager with higher reputation and track records to at least able to gain respect and control the players until all the changes are implemented.
Once these are all done and if McKenna was still doing well with Ipswich in PL then it will be the right time.
The risks are always there however I still think its far lower then when we signed ETH. Don't take me wrong I love Dutch football. Some of the finest players I've ever seen playing were Dutch. However these people are set in their way and they are pretty stubborn about it. Both ETH and LVG were obsessed with short CBs, Eredivisie players and they couldn't come out with a plan B to their plan A. Mckenna on the other hand had been incredibly adaptive at Ipswich switching things around multiple times. He understands the EPL, he understands the club, he knows the youth academy (he coached there) and the squad. If Mckenna walked into United then he would probably know more about how things really work inside the club as opposed to SJR, Brailsford, Blanc and Wilcox. That's the sort of experience we need at the club as we know very well that these players are more then capable to switch on and switch off according to how the manager act with them.
Regarding reputation that's not really important. As said this is a head coach role which is a clear downgrade to the manager's role. Transfers, discipline, hiring and firing of staff etc will all be handled by people who sit above Mckenna. What's important is his man management and his tactics.
ETH is old regime something INEOS should value. If we stick to ETH and he does badly next season then they won't be blamed for it. That's something to consider especially since we're going to kick a proper hornet nest by changing the football structure from top to bottom which in turn will cause unrest. Considering all that I think we should
a- stick to ETH for next season
b- I'd gather as much information of what went wrong at the club as humanely possible (interviews with Ole, Mou, Mckenna, Phelan, Carrick, Fletcher etc)
c- I'd make all the upheaval now. That include bringing all new people in and selling/sacking all the rotten apples
d- I'd open communication channels with Mckenna now so he'll know that we're keeping close tabs on him. We would get his opinion on whom we should sell and whom we should buy. That would motivate him to do better while keeping an eye on what's going on at our club
If ETH sink in such upheaval then tough luck. He would be just another failure from a failed regime.
That's pretty much what City did prior to Pep's arrival. They hired Pellegrini specifically to warm the bench (and take the hits) on Pep's behalf