Most individual people don't want to pay for inference hardware at all. They want an affordable graphics card for gaming. While a lot of people are interested in local inference, there are many more who aren't so they are not at all a majority.
Concentrating the relevant compute resource in DCs makes sense, but to companies seeking to sell AI services, not people overall.
Concentrating the relevant compute resource in DCs makes sense, but to companies seeking to sell AI services, not people overall.