What if SpongeBob SquarePants ended after the first movie?

SpongeBob SquarePants is Nickelodeon's most iconic franchise. But what if it ended after Hillenburg left the show and it declined?

Changes

 * Fairly OddParents would be considered Nickelodeon's flagship franchise, being then followed by Avatar: The Last Airbender, Adventure Time, Teenage Mutant Ninja Turtles, The Legend of Korra and The Loud House.
 * Despite that, SpongeBob still acts as the channel's official mascot.
 * All the bad shows made to imitate SpongeBob don't exist.
 * Nickelodeon would pick up Adventure Time, leading to Cartoon Network to restart his renaissance only after the premieres of Regular Show and The Amazing World of Gumball.
 * Adventure Time: Distant Lands would air on Nick as well rather than Netflix or CBS All Access.
 * After the series finale of iCarly, the channel's live-action schedule would be eventually axed as a way to focus exclusively on animated content.
 * Despite that, Henry Danger and The Thundermans still exist, yet as animated.
 * A few original shows will take places of some of the shows that were terrible or seasons of SpongeBob.
 * Truth or Square and Atlantis SquarePantis still exist as one-off specials/TV movies for SpongeBob post-series finale.

Shows

 * Rugrats (1991-2004, TBD)
 * As Told By Ginger (2000-2006)
 * The Fairly OddParents (2001-2006)
 * Invader Zim (2001-2006)
 * ChalkZone (2002-2008)
 * The Adventures of Jimmy Neutron: Boy Genius (2002-2006)
 * All Grown Up! (2003-2008)
 * My Life as a Teenage Robot (2003-2009)
 * Danny Phantom (2004-2007)
 * Avatar: The Last Airbender (2005-2008)
 * Catscratch (2005-2007)
 * The X's (2005-2006)
 * El Tigre: The Adventures of Manny Rivera (2007-2008)
 * Tak and the Power of Juju (2007-2009)
 * Back at the Barnyard (2007-2011)
 * The Mighty B! (2008-2011)
 * Making Fiends (2008)
 * Adventure Time (2010-2018)
 * T.U.F.F. Puppy (2010-2015)
 * Jeanette of the Space Pirates (2010-201?)
 * The Legend of Korra (2012-2014)
 * Robot and Monster (2012-2015)
 * Teenage Mutant Ninja Turtles (2012-2017)
 * [replacing Sanjay and Craig]
 * [replacing Breadwinners]
 * /The Thundermans/ (2013-2018)
 * /Henry Danger/ (2014-present)
 * Harvey Beaks (2015-2017)
 * [replacing Pig Goat Banana Cricket]
 * The Loud House (2016-present)
 * Bunsen is a Beast (2017-2018)
 * Welcome to the Wayne (2017-2019)
 * Rise of the Teenage Mutant Ninja Turtles (2018-present)
 * Pinky Malinky (2019-present)
 * The Casagrandes (2019-present)
 * It's Pony (2020)
 * Wonder Park (2020?)
 * Untitled Garfield series (TBD)