Comment by RetroTechie

That's what is expected to finally kill Moore's law: the economics. At some point it'll still be technically possible to fabricate smaller IC structures, stack more layers etc, but the tech to do so (and fabs to do it at scale) will be costly enough that it's just not worth it.

The other point is of course a next-gen fab first needs to be built, and get those yields up. While previous-gen fab already exists - with all the fine-tuning already done & kinks ironed out. Not to mention maaanny applications simply don't need complex ICs (typical 32bit uC comes to mind, but even 8bit ones are still around).