A Mac Pro tower only makes sense if you can upgrade the ram, storage, and add additional PCI-e cards. Or at the very least full support for external PCI-e enclosures via TB4.
I still don't expect Apple to release a tower (MacPro) with the same M2 Ultra chip as currently imagined. I personally think it will be more like a Xeon chip vs how intel makes i9 (for example). It wouldn't make any sense to build in a GPU, or have say accellerator engines for H.264/5/ProRaw/etc. Remove the built in RAM and storage. Cut all that out, and make an 8, 16, and 32 (2x16) core chip design. No e Cores, just P cores at 4-4.5Ghz. It should have the AL/ML (16-32 cores for those). Double the cache of the current Max.
For the 8 to 16 core variant, it's only 1 chip like the M1 Max. For the 32, it's like the M1 Ultra, 2 fused chips. If they want to go extreme, then double that for 64 in a dual socket configuration. Support up to 1TB Ram on the Ultra, and 2TB on the Extreme. 4 bays for HD/SSD/M.2. I'd go with whatever is smallest and fastest. Maybe 1 bay for an old style drive, and 3 for M.2. 4 PCI-e slots. Built in 10Gb network, 4 USB-C/TB4 ports, 2USB/A. Comes with an Apple GPU card with 32GB ram. Does all the stuff that was removed from this new chip (32 GPU cores, and the accelerator stuff). Offer that as base, then 64GB, 64 GPU Core. And for those deep pockets, a monster 128/128 card.
Maybe the system doesn't provide 800GB memory bandwidth like the M1 Ultra does, but you can expand as much as you need. Maybe the system disk speed isn't as fast as it can be on the Studio. But, you can add as much as you need. Plus with a few extra PCI-e slots you get to expand it however you need to. Maybe they support AMD again for video cards too. Either way, they can justify this kind of system and still keep the Studio available. For many the studio is perfect. They rarely change anything, and in 5-7 years of use, it will serve them very well. For those that need to make changes more frequently you have a fully expandable Mac. And yes, it will be just as expensive as the current ones, but way more powerful.