Traffic also influence ranking
 

If your site to rank up, but the site itself, no flow of words, ranking is also difficult to stable, for the sake of users, the search is not likely to take a no hits are no website in front of the row

Yes you are absolutely correct, Traffic also improve our targeted keywords ranking in serp. This leads to increase your website PR. By getting the lot of traffic of your site as well as your website backlinks should increased.