Parallel computing became important recently because even though transistor density was still increasing, heat issues forced the division of CPUs into multiple cores. Parallel computing was required to use all the transistors.

With the end of Moore's law, we won't get more performance with that approach either.

While what he said was a bad argument, on a related note GPUs have continued to show good performance increases.

What do you think a GPU is? They are the ones benefiting the most from more transistors.