I'm less pessimistic. IMHO an increasingly big factor is the amount of single core hardware out there that people have tended to optimize for at the cost of not properly utilizing multi core machines for the past decade or so. As quad core CPUs are becoming more or less standard, this is changing already. With 16-32 core CPUs becoming more commom, the pressure is on to utilize those as well.

The use cases are much broader than gaming. I'd argue any kind of creative work involving graphics, audio, video, already utilizes any amount of CPU you can throw at it. Also, software like Firefox is leveraging multiple cores with their ongoing Rust rewrite of Firefox. I tend to use multiple CPUs when running software builds. There is a lot UI code that these days is written asynchronously from the ground up; meaning utilizing multiple CPUs is less of a big deal than it used to be.

But yes, you need langauges, frameworks, drivers, operating systems, etc. that can facilitate this. I'd say there is quite bit of room for improvement here still.