Earlier quoted context omitted.
Absolutely. If this is helping users, it should be easy to convince them to turn it on.
That's not how it works. Most users don't care and will simply use whatever the default is; and when it comes to anonymous usage statistics, "most users" is _exactly_ the group of people you want to be collecting them from; otherwise your results will be skewed heavily in favor of a small minority of power users.
[EDIT: Firefox branding used to use the word privacy a lot. I can't find it on their website much at all anymore.]