I'll give my own interpretation, which is different from the parent though maybe we arrive at the same place.

Blindsight dismantles a lot of noble myths about what it means to be human and human exceptionalism. The things you read and see in all kinds of stories. It makes you appreciate how easy and unconscious it is to settle for comfortable lies over truth about how smart or great you are. I think this is what freaks a lot of people out about whether AI is conscious, actually.

I think the hope comes in if you embrace the implications for yourself, because to be otherwise is to be unconscious.