Okay, so first that that pops up is that the children of Marvin Gaye were the ones being sued. It's also revealed that Williams describes the issue in such a way that makes it sound like he wrote Blurred Lines in an hour while this Marvin Gaye song was playing in the room (just to be clear, for a typical length pop song, writing it in an hour is _remarkably, exceptionally fast_).
Now, surely this is enough to have us step back and be slightly more circumspect about this -- whatever the facts are, they are neither simple nor provided in the article. Honestly, I'd wait for a legal analysis. Lawyers are not so exceedingly stupid as to think feelings are copyrightable, and neither is the judge who issued the fines.