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FireBednarsSuccessor
Every time three at the back was tested it ended in disasters, albeit usually friendly matches and without the strongest team
Anyway this window opens the World Cup qualifying in Africa and the start of the next round of Asian qualifying. None of the 'big' teams are involved yet though
That always happens when a team used to playing a back 4 "tests" a back 3 without drilling it/having experience with it. Doesn't mean that the personnel is incapable of making that transition if allowed the time to train together in that shape. Our NT had the same issues with a back 3 before they gained experience with it...and I watched the same thing happen with gladbach at the end of Favre's tenure/into Schubert's run.
It's such a big change that you can't really 'just dip your toe in the water' on it and judge those results. So I don't think those experiments really tell us much about how it would work if it was seriously implemented with the first-teamers.