What do you think went wrong with Nickelodeon? It was amazing back in the day, and remains a big part of our childhoods. Now, it's practically the Spongebob Channel, and none of the other shows other than Harvey Beaks are worth watching
I haven't watched it in ages, but I remember watching Fairly OddParents on it a lot when I was younger, as well as Drake and Josh, and of course Spongebob. Guess that would have been about 10-12 years ago. Not sure what it was like before that... Maybe kids just don't watch tv as much anymore? They all seem to have access to phones or tablets at younger and younger ages now, and Nickelodeon probably has more rivals now than they used to; dropping audience numbers could lead to them falling back on programmes with cheaper licenses? Either that or you're just nostalgic for the old shows, and the new ones seem bad by comparison
I only watch three shows on there Teenage Mutant Ninja Turtles 2012, Spongebob Squarepants and Fairly Oddparents.