MDM makes me smile. Users have started using their own devices because of all the crap loaded onto the corporate endpoints and because it's easy. MDM tries to load some of this crap onto user owned devices or the company owned devices that were easy to use.
The only logical conclusion to this attempt at control is that users will cease to tell IT that they are using other devices, and they will cease to use company owned tablets. Users who create content always have and always will control where that content goes, and there is literally nothing that IT can do to stop them. If I create my documents on my iPad I can then use my personal mail account to distribute those documents. If the company is lucky I might deem them worthy of sending a copy to but locking devices down makes this less likley rather than more likely.