I'm confident they will work something out
Given that the IETF is the polar opposite of ICANN, I am confident that serious discussions are being had, opinions are being taken into account, and the IETF will have a proper charter and all that jazz in the timeframe they have themselves appointed.
In other words : a normal transition, managed normally by reasonable people in a reasonable way.
And that is just about as different from ICANN as can be.