Both Dan and Kyle made good points. Never saw the ending to either Rosanne or Dinosaurs, myself; just noticed when they were gone....I mean, cancelled/off-the-air.
As for Chris and DBZ, it wasn't really depressing more than...how to put it...eye-rolling, if that makes sense. Gohan was well into his teens and was a more than capable student. Chi-Chi has already gone through Goku dying (Raditz...well, really, it was Piccolo), coming back to life, leaving for Namek, being lost in space, nearly dying from heart disease, then dying again (Cell) and staying dead for years (before Goten is born, mind you), and coming back again, then she can handle him leaving for a while longer to train the (good) reincarnation of Kid Buu. Besides, you know he'll come back to her; he always has. It's just a matter of when.
P.S. Swat Kats was my favorite show as a kid...and for good reason: It. Kicked. ASS.
EDIT
deth2munkies said:
Swat Kats S1 intro = best cartoon theme song of the '90s...except perhaps Batman TAS, but it's fucking Batman.
Hold on there. I clicked on it and it says, "Embedding disabled by request.
Watch on YouTube".