Scurramunga - 2:18 am on Jun 7, 2012 (gmt 0)
This will be problematic for webmasters who have no clue WMT exists. They could be hit with negative SEO attack and have no clue how to disavow unwanted links?
I think anyone whom you may consider a formidable opponent will be savvy enough to know what it is. Especially when you consider how long it will take to roll out, make it work properly by ironing out all the bugs (of which you can bet that there will be many)