I honestly think having a fingerprint reader on the Mac Pro is totally stupid. At least if its located on the computer it self [sic].
I honestly think you don't understand the risks of man-in-the-middle attacks on this security/authentication subsystem. Connecting the Touch ID sensor to the device validating the print with USB/TB/wireless is, honestly, a stupid idea. I can think of about 8 different ways that would be instantly undermining the integrity of this validation mechanism. Making the location of the Touch ID sensor "more convenient" is throwing out the baby with the bath water.
And i don't ever think it have been done. Fingerprint scanners on computers have existed for many years., and I've never even heard of any scanners located on a stationary computer.
The "it" that Apple would be doing is putting Touch ID authentication on all of their computers -- and having integrated support in the OS and Safari to manage logins to websites (for starters).
Further, the "it" Apple would provide is the same service on all of their new computers -- including Haswell MBP laptops. All stationary Macs, and all mobile Macs. And all iPhones, iPads, and iPods running iOS. A seamless experience running across a gamut of computation devices. Nobody has ever provided the comprehensive quality of hardware and software that Apple can provide for that service.
I think Apple would be seriously ridiculed if they put one on the Mac Pro.
In case you haven't noticed, Apple gets ridiculed for most everything they do or don't do. Here's a video of someone ridiculing Apple back in 2007:
Ballmer's ridicule of Apple didn't work out too well -- he will be departing Microsoft within the next 12 months.
Cos there would be such a small number of people that would use it.
Why would you think that?
If someone doesn't want to use Touch ID, that's fine. Just like the iPhone 5S -- they can continue to use passcodes.
Even before Authentec where bought by Apple, and a lot of laptops had readers. Even then most people didn't bother using them. (I did use it a lot on my Vaio.) So for people to even think of using them at all they need to be extremely easy to use. So easy that you almost don't notice it.
Why do you think the deployment of the fingerprint scanners on an isolated laptop would be remotely to AAPL's ecosystem-wide deployment of fingerprint-scanning dedicated hardware, OSs, and multi-platform apps? The two don't sound remotely comparable.
And Apple have made only Apple store and unlocking of the phone available when using then fingerprint reader.
And AAPL provided no means for third-party developers to make apps when the iPhone was first released in 2007. Why do you presume the Touch ID pad would only be used for unlocking Mac computers?
And phones have vastly different ways then computers of getting used.
Your phone you pick up from you pocket many times a day. And that way its very convenient to have a scanner so you don't have to use a pass key.
Validation for purchases on e-commerce sites and apps is an obvious use for both iOS and Mac Touch ID device.