That takes too much effort $$$.They have correctly identified they'll get much more return by spending those same R&D dollar$ on accelerated computing.
The 4S systems 'only' requires:
- a new motherboard for 4S
- Two or three new cpu models* for the 4S boards
*Where only expensive stuff would be released with the 32, 48 and 64 cores, no need for lower count cpu cores models, that would have competition with higher cores count models from the 2S.
Socket would kept the same with the cpu packaged + board giving just a new different redirection.
Besides intel is stuck with 28 cores forever?