While I see the frustration of not having an updated Mac Pro, WHAT would they have done? 2x 6GB GPUs seem to be VERY nice for productivity. Note that these are not made for gaming.
Sure I can get a used 2012 classic Mac Pro, but that is even OLDER technology. And buying one of those in 2017 is more insane than buying a 2013 Mac Pro which is the current generation provided by Apple.
It seems like now would be the time that they can finally update this computer. Get rid of those stupid Thunderbolt 2 ports for an industry standard USB-C. Remember, we are not in the late 90s and early 2000s where processor generations are a HUGE difference. People are still using 2010 or earlier systems in 2016 almost 2017 for productivity work!
Other than VR and VRAM, GPUs are starting to feel that way too. I didn't really notice a massive difference between a GTX 680 and a GTX 980. Sure I could increase a few settings in games from medium to high. But it is not like it was a MUST upgrade. The 1080 did feel like a bigger bump even from the 980, but that might have been a placebo since I got a 144Hz monitor at the same time and me playing more optimized games.
Looking at the current Mac Pro, it would be nice if they updated it to include 32GB of RAM standard and 512GB SSD as standard. Other than that, it seems like a perfectly good machine, even in 2017. I am still using a 2010 Mac Pro people!