Both can be true. Database development, both the way they're built and the way people use them, has been focused on scaling across machines and storage for most of the history of the web; it's possible it'll never quite catch up with CPU, but it will continue to move that way. I don't know what the next evolution of databases looks like (I'm definitely not a database expert), but if Google and facebook and Amazon and Microsoft and many others need it to scale beyond what is currently possible to keep up with CPU parallelization, they'll figure out how to make it scale.