I agree totally with the original poster.
It's like Apple are orchestrating their own self fulfilling prophecy to give them an excuse to leave the professional sector...
Step 1: Claim no one uses Mac Pro's anymore
Step 2: In 2013 introduce an unexpandable Mac Pro totally unsuitable as a replacement for many owners (like me), who already own a classic Mac Pro tower.
Step 3: Report poor sales of the (new) Mac Pro line.
Step 4: Claim no one wants to buy pro machine's any more.
Step 5: Stop making them.
It's the perfect get out clause.
What Apple are missing though is products like the classic Mac Pro's with 30" displays were the 'wow' aspirational products for many - especially devoted semi pro or passionate enthusiasts (like me) and they've effectively taken that aspiration away.
These type of aspirational users are VERY important as (like me) they are the one's who are most loyal and who invest and update the most often.
Also we are the best ambassadors for the Apple brand - so we have a big 'trickle down' affect.
I shudder to think how much money I've indirectly generated for Apple over the last 20 years or so, but it's probably into the hundreds of thousands when I take in extended family members and work colleagues etc into consideration.
Not bad for an unimportant 'non pro'
So they need to realise having an aspirational flagship professional product is good for them even if it isn’t the biggest seller.
The current Mac Pro simply just isn't that product IMO - evidenced by the fact the very often when you visit an Apple Store there isn’t even one on display.
Once it can’t do as much as the product it replaces and then they stop even making the displays to go with it, it’s obviously abandoned and not an iconic, aspirational product any more.
If the recording studios, graphic designers and editing suites all use PCs, it'll be these products that many of the future pros will aspire to - and to think this used to be the Mac Pro's domain!!!
Not everyone who wants the expandability of a Mac Pro tower, needs it, but many want it all the same.
The same way a keen photographer might aspire to one day own a full frame DSLR with features they'll probably not use or a fantastic lens.
They might not be a 'pro' but they want to use the same gear as the pro's do, or...(and this is very important), he or she is more likely to become the pro of the future.
Use whatever excuse you like, but the fact is for many tasks my (almost 8 years old) tower is a much better solution than the trashcan Mac Pro is.
I write music using Logic on my Mac Pro (it's primary use) and do a bit of video editing and photoshopping too.
I'm not a pro (not for lack of trying), but I do enjoy its power and flexibility.
The expandability of internal storage and optical drives and the extra USB ports via PCIe that a Mac Pro tower gives, really is VERY useful.
Not to mention that I can run every OS from 10.6 to 10.12 and Windows 7 to 10.
I'm also able to use a 32" ultra HD display and burn Blu Ray on my 2009 Mac Pro precisely because it was upgradable.
Now I'd much rather that Apple had just offered a suitable upgrade for the Mac Pro. One that perhaps added USB3 and thunderbolt and lowered the energy use, but that didn't involve losing the options of expandability and burden me with the costs of transitioning everything to external boxes.
If they had offered me an improved tower in 2013 instead of the ridiculous form over function trashcan thing, I’d be typing this post on it.
Instead it’s coming from a Mac that is nearly 8 years old.
Way to go Apple!
PS: Sorry for the really long post!