Intel will launch SPR 'X' for HEDT. Seeing the performance of Golde Cove, it has potential. 50+c of highly clocked GCs on a new platform will definitely beat the current Zen 2 TR and most likely also the 'still upcoming' Zen 3 TR.The market position where Intel has no answer to Threadripper is why there isn't anything new in the pipeline. Just like Intel could get away with sitting on 4 core CPUs for all of those years, AMD can get away with continuing to sell existing TR parts.
They'll probably eventually have something new, but right now they're going to prioritize the areas where they can't rest of their laurels due to competition from Intel or they can make more money. Threadripper is in the awkward middle position where it's not quite as profitable as the server market and not nearly as contested as the desktop and mobile markets.
We'll get some new parts eventually, but there just isn't any pressure on AMD to do it as soon as some might like. Maybe there are some technical hurdles in there as well, but they're not vastly different from what would need to be solved for new server parts.
TBH I'm surprised AMD even bothers with Chagall/Zen 3 TR launching it in Q2/Q3 2022.