What if SpongeBob Squarepants was never greenlit?

SpongeBob Squarepants is one of the most pouplar shows on Nickelodeon and the most iconic show in the world. But what happens if the show was never greenlit?

List of Changes

 * Rugrats would’ve been the main mascot of Nickelodeon at least until early 2000s.
 * The Fairly OddParents would’ve been the main mascot of Nickelodeon since then.
 * TBD.

Original Series

 * Rugrats (1991-2004)
 * The Ren & Stimpy Show (1991-1996)
 * The Fairly OddParents (2001-2017;TBD)