They could fill the time without anything new but it would be really mundane because you'd have to double up a bunch of shows.
But if they got 1 or 2 new shows they could fill those hours easily enough.
Since it would in this scenario also be Toonami, they could maybe air some American cartoons that have older viewer appeal such as Samurai Jack, Sym-Bionic Titan, Megas XLR, Justice League, etc. They are already willing to play The Clone Wars on Adult Swim.
They would not likely be able to keep up with the ratings Family Guy and The Boondocks have been getting on Saturday though.
As I enjoy making schedules here's how I would do it.
9:00 PM - Megas XLR
9:30 PM - Sym-Bionic Titan
10:00 PM - One Piece (New)
10:30 PM - One Piece (New)
11:00 PM - Bleach (New)
11:30 PM - Tiger & Bunny (New)
12:00 PM - Stein's Gate (New)
12:30 PM - InuYasha: The Final Act (New)
1:00 AM - Fullmetal Alchemist: Brotherhood
1:30 AM - Durarara
2:00 AM - The Big O
2:30 AM - Cowboy Bebop
3:00 AM - Ghost int he Shell
3:30 AM - Stein's Gate (Encore)
4:00 AM - Bleach (Encore)
4:30 AM - Tiger & Bunny (Encore)
5:00 AM - InuYasha: The Final Act (Encore)
5:30 AM - InuYasha
HELPeR for the TOONAMI, Mobile Suit Gundam, Dragon Ball Z, Harvey Birdman and Perfect Hair Forever boards. Feel free to ask me anything on those topics.
sketch only puts the arrogant whiney punks in their place... sort of like batman, except on the {AS} boards - THECZAROFGNAR
Sketch, should we make sure it's imprinted on your grave stone "He felt very strongly that Bleach belonged on Toonami!" - .hack-SIGN_John
"We aknowledged that Toonami is cooler than us... and they aknowledged that we're full of ****." [adult swim]