What happened to Nickelodeon?

I was born in the late 90's so i never really got to enjoy the really old shows like Rocko's Modern Life,Doug,and Aaahh real monsters!! Although i saw some i really enjoyed like Rugrats,Hey Arnold!,and Kenan and Kel. Sure they have a few old shows on Nicktoons Network and The N but not nearly enough!! Nickelodeon is forgetting what made them the #1 kids network in the 90's!! All the shows they used to have had life lessons in each and every episode where you could laugh while learning I'm almost completely positive the kind of shows on now a days are why kids aren't as smart! i have wrote letters to nickelodeon and emailed them they haven't done one good thing!! Nicktoons Network is all of a sudden all about superheroes!! What's the deal?Kids can't relate to them! I think if Nickelodeon sat aside an hour or two a day to show older progrmming (different shows every day) they could get a BIG boost in ratings and even 20 year olds would be watcing!! if you agree or just want to tell me what you think reply!!