By 2020 I see Adventure time ending as well, it's wierd to think that we're much closer to 2020 than 2010 but the decade is ending and a lot of the defining features of it will leave as well. Regular Show and Adventure time are probably the top 2 defining cartoons of the decade like Rug rats to the 90's and SpongeBob to the 00's but no kids cartoon runs as long as SpongeBob does, and frankly that's a good thing. They ended Gravity Falls recently and I felt the same way, in a way its the end of an Era
