I want to say Shout tries to complete things, but they left Gadget, Heathcliff, and Cops one set only, leaving their rights to be split into different companies, most that didn't want or didn't know what to do with them (Cops, ironically, is going to get a more complete release from Mill Creek or something). But they tried hard to get all the Nintendo cartoons out, and even managed to get the complete Sonic the Hedgehog Dic shows,. even if it meant releasing the third AOSTH as an online exclusive. And they HAVE been completing the Transformers sets... so I guess it depends on popularity.
I would imagine the Nicktoons would do well enough to complete... after all, most of these had short to medium level runs. though I still don't see the clamoring for Hey Dude.
I just hope Rocko isn't edited to dust, though...