The incentive structure of an IT worker is similar to that of a government bureaucrat: When in doubt, ban.
Because the one time something happens, you're gonna hear that the systems were 'improperly secured.' Then they'll call in external auditors fresh out of school working from an over-photocopied checklist to tell you how incompetent you are.
Personally, I'm happy with trends like BYOD etc. If the CEO loses data because he wanted email on his iPad (and there is absolutely nothing wrong with that), then IT won't be blamed for it.