It never was completely free: there has always been a limit on the number of hours per month you could stream music.

Anyway, your analysis is wrong, because you think your usage predicts everyones usage pattern. It doesn't. I'm a happy paying subscriber and will stay one for a while to come. If I hear one new CD a month, it's already worth it. Even if I don't, I love being able to just legally browse and listen to almost any music I can think of.