It's nice to see this from Apple as it did feel like they were abandoning their line of computers for professionals. While it was a far fetched hope, I was really crossing my fingers they were going to announce a touch enabled surface for the iMac Pro as a competitor to the Surface Studio.
My daughters have a Wacom tablet and it works very well, I was just hoping to be able to invest in a better Apple product that supported professional drawing on screen. It's so much more natural to draw directly on the display itself.
The iPad Pro did however catch my eye with the newer display, iOS 11 features and pen technology. I wonder if its becoming a better device for drawing as most professionals didn't recommended it for the first model of the Pro.
The word is Apple tried and failed to bring touchscreen support to macOS, so instead decided to focus on iOS with iPad Pro. Ubuntu tried the same with Unity and failed once again. That makes you realize just how brilliant Windows 10 is - one OS, one UI that scales from a phone, a tablet, 2-in-1 to desktops and workstations.
So, yes, at this point I don't think there will ever be a touchscreen Mac. Shame, really, though the desktop form factor is one where touch isn't all that crucial. Surface Studio like use cases do make it very interesting though!