A lot of the time the perfect user for Chrome OS is too scared by how different it is. I tried it with my father and sister, and they both wouldn't use it. They were too confused by it and how cloud-based it was (even though they stream all their music and keep all their photos only on Facebook), and stopped using it. I tried Ubuntu, and just telling them it was Linux was enough for them to be scared, and blame that for any problems. I eventually settled on Elementary OS for my sister, and told her it was Mac OSX, while my father still uses Windows XP. (Sigh.)