Firstly I hope you're wrong about Zlatan. One more season. At least!
I think there's plenty of experience in the team. Next season will be De Gea 8th season at the club. Jones: 8th. Smalling, 9th. Valencia, 10th. Mata has more than 10 years in top flight. Pogba since 2011, Lukaku since 2009. Matic has been around the block. Mkhitaryan nearly 10 years as pro. Rojo and Blind ditto. We have a good team with plenty of experience. For me it's just not an issue.
I don't entirely agree that Ozil is in absolute prime, I think that was Real Madrid. Age 22-5. His technique is excellent though and he's still very good. His game relies on high work rate rather than pace, yes.
I think it's happening anyway, and I'll support him for sure. I'm not claiming it's a total disaster. As you say his style could very well suit us provided we can get the ball to him.