Will site-wide links be targeted in the "kill the paid links" campaign

I've been thinking about how Google will be identifying paid links, which Matt Cutts (the Google Mouth) has reminded us all will be devalued. There are a couple easy ways:

• Links from websites like Bid Directories where it's obvious that each link is bought and paid for
• Links without any real content surrounding it (although this one will be trickier to filter since lots of websites have "quicklink" areas in the sidebars/footers that are navigation guides)
• Links in close proximity to words like "sponsored links", "advertisers", etc.
• Links that show up in high numbers on sites with little relevancy. This one is easy for Google to devalue since they want highly relevant links anyway

But what about sitewide links? Will Google use this as a means to identify paid links? Many times, paid links are pushed sitewide for the extra PR juice.

Just something I was thinking about...