AMD is becoming as user hostile as Intel; the only interesting Threadrippers for pros that need a lot of RAM, and all is restricted to OEMs only. After the x399 upgrade fiasco, here comes another blow to loyal users.
If you're custom building PCs, I really doubt you're under-served by their existing lineup. Any time savings you'd get working on a TR Pro machine over regular TR or Ryzen are probably negated by the time you spent fiddling around with assembling the computer and configuring it.
IMO, there are too many computer enthusiasts out there fixated on having powerful machines as a sort of status symbol. It ends up being a waste of good computer parts.