Again, a full plate to which to respond. Y'know, when they get TTA, Nick just might set up a block. All they'd need would be The Sylvester & Tweety Mysteries to recreate the Big Craptoony Show. Of course, that'd mean more of the hack jobs we've come to know & loathe; but seeing what Nick's done with certain openings, I have a feeling they wouldn't have a problem with that. I would like to see a block of Transformers & GI Joe; maybe mix in a little Star Blazers or Robotech, some classic Voltron, perhaps? As to the other thing, CN is currently showing Garfield I think, & last I heard of Heathcliff it was on Nick, but that was years ago.
If you don't like your options, make another option.