I was eyeing these new threadrippers for a while now compared to intel's X299 and the news of Zen 3 sealed the deal for me. I picked up a 3960X & Zenith II Extreme with the plan to pick up a 32 core Zen 3 CPU next year to replace the 3960X. The only "problem" with my 3960X is that it only boosts up to 4.5Ghz with very little actual overclock headroom. 4.2Ghz PBO all core boosts with low thread boosts up to 4.5Ghz is the most I can get out of the chip and while the IPC is good, clock speeds are still a smidge behind intel, overclocked vs overclocked.
Zen 3 with the ~200Mhz uplift and the IPC gains really should top whatever HEDT intel has to offer in the next 2 years, maybe even 3. Plenty long enough to justify going to Threadripper for a generation.