It looks cute, and the triangular vertical arrangement is an interesting approach, but… it kind of quickly falls down? Even if GPUs had evolved the way Apple wanted them to, a lot of Mac Pro customers don't really buy it for the GPU horsepower (what good is that for developers?). Not to mention that they over-bet on Thunderbolt 2 (not even 3!). So then what do you do, multiple CPU sockets? That's not really en vogue any more either, outside of niche high-end server systems.
A taller Mac mini seems a more likely product.
My guess is between the higher-end Mac mini and iMac configs, the 16-inch MacBook Pro, the iMac Pro, and now the new Mac Pro, Apple is satisfied that it has covered a fairly broad range of professional Macs, ranging from $1k to tens of k. There's speculation that the iMac Pro might not even be a successor, but rather that the iMac inherits its cooling improvements and possibly scales more. Works for me.
The trash can story has to be an interesting one. Hubris, it seems. They had an interesting concept, and it could've worked well for audio/graphics/video, if the stars had been aligned that way. But even if that had occurred, it doesn't make sense to me that they thought this would viably fulfill all high-end desktop needs?
(I want the trash can's port lighting, though!
And I hope they fix the iMac's ports being so hard to reach.
So maybe a new iMac can have ports that are still hard to look at, but easier to reach and illuminated. Just to have this one little thing that's salvaged from the 2013 design. Everything else, it seems, is trash…)