Benjamin Franklin once said, "Nothing is certain except death and taxes." I'd add " Grey's Anatomy " and "Law & Order: SVU." On March 30, ABC and Shondaland announced that "Grey's Anatomy" will extend its run as the longest-running primetime medical drama in American TV history with a 23rd season. On Thursday, Variety reported that "Law & Order: SVU" has been renewed by NBC for a 28th season. "As per usual, the renewal comes as little surprise, as the now flagship show in the 'Law & Order'