So few cartoons actually have a solid ending. Maybe Jackie Chan Adventures (though, with every season, they managed to wrap up all loose ends in case they didn't get renewed).... but every cartoon I've seen just manages to meander off on some tangent and they rarely ever acknowledge they're not going to be back. We're never fully satisfied and want them to continue, or at least comeback in some way or form. And when they do, it's NEVER good enough.
Characters like Mickey, Bugs, and I'll even throw in The Muppets never die. They need to come back every so often with something. Now, at the risk of sounding hypocritical I HATE the look, feel, and overall educational content of Mickey Mouse Clubhouse and WANT them to go back and do a Mouseworks like show... but at LEAST they have Disney characters in the Disney store Disney created (or took credit for).
There are a lot of BAD reboots out there (George of the Jungle... I mean, REALLY? Even the movie got his personality right), but there are a lot of good ones as well. Again, I LOVED TMNT until the toy company started futzing with the format. Though, the only GOOD sequel to Yogi Bear was Yogi's Treasure Hunt, maybe the super stars 10 movies ... the live action movie, Space Race, and Yo Yogi (in that order, BTW) were all garbage.
LT had only 2 REALLY bad reboots, IMO... Baby Looney Tunes and Loonatics Unleashed... and I really ran that into the ground, but they were just terrible. Though, to be fair, LU seemed to turn the corner in the second season with some watchable episodes, but it still was generic. Even the movies were enjoyable enough. However, I cannot stress enough that the late 60's ones (with exceptions, particularly Chuck Jones's experimental book based cartoons) were extremely hit or miss. I HATE Injun Trouble. it's just bad Native American Stereotype jokes for 6 minutes.
I want to keep the old stuff, no doubt about it, but I want NEW stuff. New shows, new characters to love... new experiences. But even then, I want to see old friends in new stories within reason. I LOVE Tiny Toons, Duck Dodgers, Sylvester and Tweety Mysteries and Taz-Mania.