CMOS process scaling is already on its last legs. There are various options: more efficient code (ROFL), stacking of various sorts, new material/techs, co-processing (GPU, FPGA, quantum for certain classes of problems), etc.

But there's certainly a school of thought that CMOS process scaling was the big engine of tech over the past few decades and there may be nothing that comes close to replacing it to anything like the same degree.