I'm surprised Bebop is even doing that well since it has been on adult swim for several years. I can't recall it being taken off the network in a long time if at all.
Also, about this. The thing is they have almost nothing they could replace it with.
Here's the anime they have the rights to:
Bleach (along with some movies)
Fullmetal Alchemist: Brotherhood (they recently renewed it)
Cowboy Bebop
Ghost in the Shell: Stand Alone Complex (both seasons)
Deadman Wonderland
Casshern Sins
Durarara (got it for another year)
The Big O (season 2)
It seems like they no longer have the rights to FLCL (only six episodes anyways) and Inuyasha, though I can't say for sure. They did recently lose the rights to Kekkaishi though.
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Nio-chan and Ctes: http://img.imgcake.com/nio/Untitledpngyn.png
BroAndCharAndCtes: http://i.imgur.com/oBQfY.png