First desktop quad core came out pretty exactly 12 years ago:10 core mainstream.... Bonkers. When you consider 18 months ago we were stuck to 4 core for almost 10 years.
https://en.wikipedia.org/wiki/Intel_Core_2
Let's hope next ten years go better for CPU development than previous 10 years.
And really best guarantee for that is AMD gaining strength.
Anyway 10 core CPU is rather unlikely, for stated reason and for current node.
Unless it's dual 6 core CCX chip with 10 active cores.
But unless manufacturing process has improved enough to allow higher boost clock states than in 2700X it wouldn't make much sense:
Design and testing would have needed resources, lot better spent on elsewhere. (just like AMD prioritized getting Zen out over Vega)
7nm Zen2 chip used for EPYC 2s would be more sense making.
But that would need well enough working 7nm production from TSMC.