PR will not be turn off anytime soon on the Google toolbar. Without that little green bar there would be no reason for SEOs and link buyers and link sellers to install it

The Google toolbar is a critical piece of spyware that Google uses to watch the people who they consider competition (text link advertising). “Keep your friends close and your enemies closer”. The toolbar helps keep their enemies very close. Because I don’t want them to know my personal business, I uninstalled the Google toolbar long ago.

If you don’t want Google to have a window into your SEO business, get rid of the their toolbar and check PR with the metrics checker.