Re: BYOD - for the lucky few @AC 14:43
1: One purpose of centralised IS provision is to consolidate services to a standard ensuring that one set of services meets all needs.
2: Another purpose of centralised IS provision is to have a single point of reference and contact for problem-solving.
BYOD, compared to a well-implemented corporate device provision policy, will by definition involve a wider range of devices and configurations. This will have two impacts:
With regard to 1) it means that consolidation of services requires more effort because, despite the actual tasks being the same, the tools used to complete the tasks are more diverse. Being able to support 10 applications requires more work than being able to support 5, even if just at the "how do I?" level, but especially at the patching/distributing/licence-tracking level.
With regard to 2) it means that you're spending more money on spare parts and loaner machines (because consumer devices mostly don't have NBD on-site support, and when someone's MBP needs a new motherboard telling them they've got no machine for a fortnight doesn't work out well, and that's aside from the way that the BYOD usage model doesn't tend to involve people putting their data onto shared storage where they can access it from another machine easily...)
So - you're requiring a potentially substantial increase in knowledge (ie training resource) from your support staff, and an increase in work required to keep up the standard maintenance work. And that's before you discuss the cost of implementing proper network segregation if you don't already have it.
At this point, the onus is on you to prove that this will still work out to be cheaper or in some other way beneficial to the organisation than using the standard corporate model. You've not done that yet. I agree that discussing it rationally with actual numbers/reasoning is the best way forward, but short of throwing the exact sort of strop that you claim anti-BYOD types of throwing, you've not really presented your case very well...