They already are although supercomputers are no longer the realm of governments. Tesla is working on one. Google and Meta both ordered a ton of H-100s last year from NVIDIA. I have no idea if they are building a supercomputer cluster with them or they apply to separate data centers.

Supercomputing is an indicator of overall computing. We see distributed computing picking up steam as technology advances. However, the big boys are still a metric to follow of how the industry overall is advancing.