Yes, in that regards, Cookie Jar is quite lazy. They have older library shows, but people (i.e. networks) largely want newer fare rather than older shows. They'll produce three shows and air them ad nauseum. However, and this is off the top of my head, they could add something like, say, Liberty's Kids, Will and Dewitt, The Littles, Madeline, and Simon in the Land of Chalk Drawings (the latter of which would actually be a kind of homecoming considering it was once shown on CBS's marquee Saturday morning franchise Captain Kangaroo), still be e/i, and actually have variety,
Qubo does have an advantage of being an assembly of content providers (Classic Media, Scholastic, Nelvana, and NBC Universal) and one disadvantage in the form of the majority owner, ION Media, which owns the actual digital channel but imposes its own viewpoint on the shows that airs on both the network and the NBC/Telemundo blocks.
Truth be told, you're letting a block aimed towards preschoolers worry you, Jeremy.
Relax.