Sure its potential. PR is set by the standard of its incoming links. thus if you've got additional high PR backlinks informto 1 of your subpages, then that page will have the next PR. You're main page is generally the best hierarchic page as a result of it's what you are doing most of your backlinking and seo for. however if you've got a subpage that is obtaining plenty of natural backlinks, and a few of them area unitfrom high pr sites then that page will get the next PR.