My mom works as a translator and all she needs is email, something to edit documents in and a browser, thats it. She was able adapt to ubuntu pretty fast even though she's not the kind of person who likes learning new tech.
There must be millions of users just like her. But people are very resistant to change and few have an annoying linux evangelist like myself in the house to push them.
We need to get them young somehow. I'm thinking around highschool.