Just a quick point... anything with glass in front and black behind it will serve as a mirror...
You get the same effect from a CRT showing black (maybe just a little warped because of the shape), and no-one ever complained about them since the dawn of time.
Actually, you are a bit wrong there.
The original CRT monitors did have a glossy finish that produced a lot of glare and reflection (similar to the new glossy LCD screens).
Around the mid-1980's, the world decided that the glare was hard on your eyes and produced unnecessary eye-strain (especially when your job required you to stare at the screen all day).
So, the computer industry responded, and started producing screens with special anti-glare and anti-reflective coatings.
In-time, it became almost impossible to buy a monitor without the anti-glare and anti-reflective coating. And, eye-strain complaints were significantly reduced.
Now, sure, the modern CRT can reflect images from behind you when the screen is off and you look very carefully from a specific angle where you are not directly in-front of the CRT screen. But, if you are directly in-front of a modern CRT monitor, then you will likely not be able to see a reflection of anything behind you. And, if it is on with something displayed, it would be nearly impossible to see something behind you.
The new glossy screens really do seem to be a step backwards to me. I'm waiting for the corporate ergonomics organizations to start discussing glossy screens and rule them as inappropriate for the corporate environment. Then, we'll start seeing the movement back to matte screens.
Companies like my wife's office assess everything from the height of the desk chair, the angle of the keyboard in relation to your arms, the height of the desk surface, and the height and angle of the monitor.
If the new glossy screens fail to meet their standards (as the original CRT monitors did), then there will be a lot of companies that Apple won't be able to sell to. And, of course, it is usually the companies with huge purchasing budgets who perform these assessments. And, that's not the kind of purchasing budget Apple wants to be excluded from.
My wife's company has a corporate discount with Apple. But, if they can't get a product from Apple that meets with the ergonomics department's requirements, then Apple won't see much money from them.
And, of course, you're not going to see companies putting a Mac Pro on every office desktop. So, the iMac could very well work itself out of a market (of course, there is always the consumer market).