I just don't see how a show that has aired on CBS for 18 straight seasons just suddenly switch to a new network. It just seems to Unamerican. I feel like at least with CBS and to an extent, American Reality/Game Show programming, they want to keep the same host and same network for as long as they can. We just don't do what the rest of the world does. American TV viewers just expect that level of Orthodoxy from programs and has been for years. This would be especially true for CBS's fourth-oldest Primetime program.
Besides, the Fall line-up is NEVER set. People forget that's not written in stone. They have three new shows and CBS loses a new program right off the bat, which is expected from MacGyver. If Bull gets cancelled, that opens up two slots. Plus, who says "Primetime Saturday" can't become "Big Brother Saturday"? Or they can move Saturday's shows. The only thing that I can bet is Thursday's are out due to Football and there is no room/no need to move it to Monday. I'm not sure why they wouldn't move it to Wednesday's for eviction, considering Survivor is already there. THERE IS ROOM.
The only way Big Brother ever goes to Pop or Online only is if someone in the future pulls a Jade Goody and CBS no longer can no longer associate with the show.