You obviously don't understand the market that the Mac Pro is catered to. When your computer is for work, and not to look good, it needs to be upgradable, it needs to have proper cooling, and it needs to be reliable.
Not getting the job done on deadline because your machine is still rendering, or it's throttling down because of heat, could mean losing the job and thus a $40,000 check, as well as a damaged reputation.
The fact of the matter is that the iMac is not as capable as a (future) Mac Pro, nor does it replace the place in the Market for the Mac Pro (FYI, I'm typing this from my fully blown 2012 iMac).
Yes and the absence of any news on a replacement for the Mac Pro is starting to show.
We get a trade Film and TV paper from the UK every year. I do not know why we get it but it comes free in the post. It carries all the the broadcast news and covers all the reviews and articles on new equipment for that market.
Up to last year there were always several ads showing lots of Apple product wether that was a B&H ad or ads for editing facilities touting that they had the best of Apple equipment to hire. All that is now practically gone from this publication.
The current edition gives a very good review of some high spec laptop running Windows that has the spec of a desktop. I think it even had two Graphics cards and the reviewer even says that the metro interface is quite useful when used on a second monitor. Lots of other photos show editing and other broadcast software in the publication and it all looks competent and you get the sense that the users probably are happy enough to use all this Windows based software and I think this is where the general Mac enthusiast doesn't get it.
The real pros in their selected discipline generally like or, are at least used to, using complex and busy interfaces. That's the nature of the work they do.
Apple are streamlining and making things easier for the the everyday user but this may not be what the technical pros in broadcasting actually want. They have just moved on, especially where budgets dictate that they can move lock stock and barrel to a different platform. I don't think they loose much sleep over it, as long as they have access to a fully functional and feature rich piece of software say like Avid. Do they really care if it is on Windows. Do they care that the OS is supposedly more crappy than OS X. No they don't because either they are competent enough to deal with any of the problems that crop up or there is an IT guy that will sort it out for them.
Don't get me wrong. I would love to see Apple come up with something new and amazing but I thing the company has moved into a new space over the last 6 years since the advent of ios.