Here is a response from Yahoo.
Joel McHale reported the show's demise in an interview with Metro Weekly.
McHALE: No. They wanted to. But all of our contracts were up after six years. All the actors on the show, almost without exception — their stock has risen significantly and it’s out of the pay rate that is affordable to make the show. So you’re not going to be able to get Alison Brie or Gillian Jacobs at a normal television salary anymore. There is just not enough money to be able to pay for the show.