We all know that it is possible to make a musical based on The Wizard of Oz. We've all seen the original film. There's also The Wiz and (sigh) Wicked and The Muppets Wizard of Oz. If Kenya Barris wants to make this film a musical, he can. I don't think @Tino is disputing that.
The point is...
If this was going to be The Wiz, it would be under that title. The fact that they are calling this The Wizard of Oz makes clear to me that it is not that.
There is no question that Oz is a title where the property where will accept songs easily. But it is possible to do a film set there...
If Barris was remaking The Wiz using that score, which I would be fine with, it would be under the title The Wiz.
The fact that this is being referred to as The Wizard of Oz suggests that it is being modeled after the 1939 film even if it has a more diverse cast than that one did. The Wiz is a...