In the past we built a couple of sitewide links. The sitewide links built were directly a longtail keyword deeplinked to the category on our site. The keyword itself is fluctuating between position 10 and 15 for the last few months. What's the general opinion of sitewide links in today's SEO world? My question is, shall I contact one of the places we've got sitewide links and ask them to only link once (rather than every page on their whole site!!). If I do this what are the forecasted results be afterwards in terms of position for the keyword in question on Google's SERPs?