That's exactly right. Even in the HPC world where I work, power is already at the top of the list of concerns. Performance always matters but we don't have unlimited resources as we could imagine just a few years ago.
One thing that troubles me about the conversation is the idea that one can determine power needs based on whether the machine is running on battery or not. I know that it can be customized. It's the thought process and assumptions made that concern me. We're at the point where EVERYONE needs low power, just various degrees of it.