Maybe instead , we'll start really asking what is the good life(for both society and the person), we'll probably get answers like(from various philoshophers and religions): life full of love, compassion, empathy, peace, trancendence, meaning, service, self-actualiztion, health, etc.
And better understanding, control and training of the brain(maybe by using fmri neurofeedback) may be a great tool in achieving all of those qualities in a safe, effective and efficient manner, and of course fully based on personal choice.
How can this expand what it means to be human ? how could it shape society ?
And instead, we're talking about typing with the brain.
And we see this kind of thinking everywhere. for example , the world is filled with tons of "social" technologies, but we can't even get video chat with eye-contact, at people's homes ?