I think I recall somewhere the guy who made The Incredibles (2004, for those who don't know) said he didn't want a sequel to his movie (he wrote/directed it, not sure) because that movie universe was perfect as it was.
Now here we are in 2015, and tada, Incredibles 2 coming soon to a theatre near you.
(Okay, I'll be honest, I've been DYING for a sequel.)
(Also Toy Story 4 was announced months ago, I believe.)