Randy Shulman of Metro Weekly recently interviewed Joel McHale and asked him the all important question:
"Is it [Community] getting another season on Yahoo?"
"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."
While this may not be gospel, I do believe treating the show and everyone involved with respect is important. Don't infuse something that stands with authority on its own with more cash. Let it die gracefully, make the movie, and sell us the Six Seasons and a Movie premium Blu-ray box set.