Isn't it scary?

Soo, I recently watched Kimi no na wa. For those of you who haven't seen it yet: Go watch it NOW, it's just awesome. The story however left me thinking about how absolutely scary the thought of forgetting about your past and the people you love really is. I mean taki and mitsuha basically lived for 5/8 years without knowing anything about what happened and they probably won't ever remember. All of us could be in the same situation and we wouldn't know it, scary right? xD Any thoughts about this topic?