IMO, Nickelodeon has been lagging behind Cartoon Network and Disney Channel in terms of quality content this whole decade. CN has/had Adventure Time, Regular Show, Steven Universe, and Gumball. DC has/had Star vs, Gravity Falls, and the new Ducktales. What has Nick had to offer besides The Loud House? Fanboy and Chum Chum, Sanjay and Craig, Breadwinners, and the corpse of Spongebob.
And the few good shows they DID have (Legend of Korra, Harvey Beaks and Welcome to the Wayne) were screwed over because they didn't do Spongebob-level ratings.
The future doesn't look too good either. While CN and DC have upcoming shows that look promising like Mao Mao, Infinity Train, and Owl House, Nickelodeon is making Spongebob and Loud House spinoffs.
So, I have to ask: What went wrong with Nickelodeon?