Yesterday, I just sorta drunkenly staggered over here, metaphorically speaking, from my usual haunts in the Mac mini and gaming forums. While I could afford a Mac Pro, I would have no idea what to do with one, so I never really spent any time here. That's why I find this discussion so fascinating, because I didn't realize that there was as much resistance to Apple Silicon as I have seen here. Sure, the Boot Camp crowd has been quite vocal, I'm not dismissing their concerns, either, I use it for an occasional Windows game on my 2018 Intel Mac mini.
From what I gather there are two camps here: those who are open to the Apple Silicon future, and those who want the Mac Pro to stay the same. For the former, there's not much to consider, since that just follows the pattern that every other product in the Mac line has followed, from the lowly Mac mini and MacBook Air, to the new Mac Studio featuring an Ultra.
For the latter, I sense some hard choices are coming, which are not going to be popular among a subset of this forum. Again, I have never downplayed those concerns, but I think this is the crux of it:
The best thing Apple can do right now, is another generation of Intel machine, a processor and PCI update of the current machine, with an Apple Silicon based Afterburner, to run AS-optimised code for its media engines, isolated AS VMs etc.
Many of the folks here want another Xeon Mac Pro, the Apple Silicon approach is unacceptable, and Apple needs to turn back the clock. Here's where the difficult choice may arrive. Even though Apple put a lot of engineering into the 2019 Mac Pro, most of the features that are considered desirable are a result of Intel's work on the Xeon platform. Apple designed the case and created the oddball MPX modules, but most of the underlying tech is Intel proper. Xeon is high-end, but still a mass market product. The Mac Pro is not, it's a niche product, among a lineup of computers that are already boutique.
From Apple's perspective, does it make good business sense to spend engineering resources on external DIMM slots, third-party GPU support, swappable CPUs and storage, or specialized MPX cards? I don't have access to Apple's sales charts, I just have suspicions based upon the rumors from reasonably reliable sources and the entire lineup of Macs currently available, save the zombie x86 Mac Pro.
We live in a slightly different timeline from an alternative, one in which the iMac Pro was meant to replace the Mac Pro, and Apple decided to give up its lowest volume computer. While that may be apocryphal, and Apple never intended for that to be the case, I don't see it as outside the realm of possibility, and that many aspects of the Intel era are going away.
I've owned four Mac minis, the first PPC model, and three Intel versions. Each of them I upgraded the internals, such as I could. Now the Mac mini is locked down; keep in mind the "listening to pros" notion that Apple spoke about included the Mac mini, not just the Mac Pro. The Mac mini is now a sealed box and I'll just have to deal with that going forward.
Mac Pro users may have the same future ahead of them, just as every other Apple Silicon Mac is a sealed box. Apple isn't doing it to be mean, there are substantial benefits to their approach, which is outside the scope of this discussion. I'm just pointing out the trend that we can all see.
My unfortunate point being is that, while many good folks here desire the spirit of the Mac Pro to continue, Apple may be fine with losing those who want all the trappings that a PC has to offer, inside an Apple box. If that is the case, then there are plenty of Xeon workstations that run Linux or Windows. That stinks for folks who don't want that in their computing future, but Apple may not consider that a priority. Keep in mind that the Mac makes up 9% of Apple's total revenue, 85% of that are laptops, and the Mac Pro is barely a rounding error on a spreadsheet.
...and perhaps I am wrong, and Apple will create the dream tower to slay the Xeon dragon. Again, this is just two-cents from a relative outsider who is trying to weigh Apple's options, and guessing where they will go, based upon recent trends.