He never played it unless we were looking for an equalizer and he didn't play it in pre-season either before Deulofeu's injury.
There's absolutely no reason to think it would fall on it's arse. It's a 4-3-3 the most popular formation in modern football not some untried new way of playing.
When Utd won the league with Tevez, Rooney and Ronaldo which one of them was the "playmaker"? None of them. They're all direct players who will also create for each other the same way Deulofeu, Mirallas and Rom get a decent amount of assists each season.