Hopefully a new Mac Pro that doesn't only cater to the super rich.
Yes, you're correct, we pay a premium for Apple computers, which if you purchase the same horsepower from any other manufacturer, you'd pay much less, but then you'd be running Windows. I've never seen anyone justify why Apple's products are so much more expensive in a factual way. We pay for the logo willingly.
I'm not sure the 2019 Mac Pro is much more expensive than an equivalent specification HP Z-system or Dell Precision Xeon workstation having similar specs. You could argue that Xeon isn't needed, or super-fast SSD isn't needed, or ERC memory isn't needed, etc. But in the pro workstation market, corporations want that and pay for it. They paid that before the 2019 Mac Pro existed and they would continue paying that if Apple totally existed the market segment.
If Apple can deliver an Apple Silicon Mac Pro which delivers similar performance to a Xeon workstation for a lower price, that will send shockwaves throughout the professional workstation market segment. HP and Dell pay a premium for Xeon CPUs, "pro"-class GPUs and associated hardware. They don't have good alternatives -- and neither did Apple before they started designing their own CPUs and GPUs.
What a lot of Mac fans want is a consumer-class "desktop" machine with a separate monitor, not a true pro-caliber workstation. Apple may have three answers to this (1) An M1X Mac Mini, (2) A high-end M1X iMac, (3) An Apple Silicon Mac Pro which starts at a lower-priced config than the current x86 Mac Pro, yet scales upward to the pro workstation zone.
The M1X Mac Mini will probably be significantly faster on both CPU and GPU than my 10-core Vega64 iMac Pro -- at a fraction of the price. It will likely have a lot more ports than the current Mac Mini. That handles a certain class of users. As already seen on the M1, Apple's new CPUs have greatly improved hardware-accelerated video decode/encode.
The high-end Apple Silicon iMac (or iMac pro if they do one) would handle another class of users who want (or will accept) an All-In-One machine.
The Apple Silicon Mac Pro is furthest out, but it must ship sometime next year to fulfill Apple's two-year plan. If it uses "chiplet" fabrication to integrate four M1X CPUs on one package, that would be pretty fast in both CPU and GPU. If they use a follow-on chip using better silicon fabrication (say 3 or 4 nanometers), it could be even faster. We don't know the price but Apple using their own CPU/GPU and their own glue logic could theoretically enable a lower-priced entry-level config relative to the 2019 Mac Pro.