It's an incredibly simple equation:
1- Do you need a Mac Pro now? If yes, buy one and derive immediate benefit/enjoyment.
2- Do you
want a Mac Pro now, but don't really
need it? If you have sufficient disposable income that it really doesn't matter, then buy it and derive immediate benefit (measurable in happiness/enjoyment vs. dollars it's making you).
3- Don't buy Mac Pro because a) it doesn't meet your needs/desires/emotional state pro/con Apple, b) you can't afford it. c) you're waiting for the next model because it'll be better (but flawed in different ways which produce the same dynamic and endless series of conversations no matter what Apple does, be that PCIe, AMD, Mega-ARM chips, or Tesla anti-gravity package instead of feet or wheels).
Corollary to c above: the Mac Pro lives in a special alternate universe where time works differently than other Apple products/rest of this universe (but may be compatible with other parts of multiverse). Next update may take half a decade, longer, or possibly forever, because this was the last Cheesegrater. Apple may decide that The Cube(s) failed, The Trashcan failed, stacking Mac minis isn't sexy enough, and cumulative total sales of 7,1 -- due to high entry price, and roughly 60 day window of time wherein it was actually available for sale before Coronavirus crashed world economy -- inclusive of institutes, studios, 35 crazy people who post to this site, and ultra high net-worth individuals who are tech bros and want a 40-50lb giant metal sculpture sitting on their desk, was less than 5,000 units sold; therefore the most logical NeXTSTEP is to introduce Floating Spheres Hovering around Pyramid (which houses quantum CPU) and sell base unit starting @ $175K. Improved Mac Pro will feature revolutionary T5 chip with AI that knows exactly what's best for you without taking input from user (can be disabled using 2 paperclips and a soldering iron).
Anything is possible -- except Apple making a less expensive version, or getting over their hatefest with Nvidia -- absolute silence/nothing for many years is most probable based upon Apple's actions for past decade coupled with recession we're entering.
Pardon me, gotta get back to doing my part to save the world and remaining socially distant while staring at candlestick patterns on momentum oscillators for stock market -- Ohhhh, technicals are flashing skull & crossbones, Hindenburg pattern last seen on Black Tuesday in 1929, and indicate Swarm of Locusts is coming, so we're nowhere near bottom yet -- and I realize it's been nearly 2 hours since I refilled my drink, gotta go. Cheers!