I'd much rather have a LONGER case than a taller one...
You insist on saying things that I agree with don't you Tallest?
Having a longer tower with at least 8 bays would make the Mac Pro even more expensive, but would put it in line with a lot of mini tower servers offered by Dell.
The only issue I see with it is that many users desks can barely handle the current Mac Pro, and you know that all the tech junkies will want to have the latest and greatest to use Firefox and look at Facebook on their 30" ACD that's on a desk far too small for their system.
Getting back on topic, I still don't don't think Apple will do anything major to the Mac Pro's innards. I know that we want them to, even with new chips that support it, but Apple is a big fan of f*&$#ing with us in terms of hardware.