You could easily put 7.1 surround sound, a projector and an electric screen in there, for a home theater by night, living room by day type set up. I've done it myself!
Crazy thought - What about dropping the screen over the windows to the outside (the wall right of the current TV position)? Your couch could stay for seating along the right wall of the "Theater Setup". You could slide the recliner into theater viewing position. Aside from the center channel, all speakers could be double wired for using when faced to the TV or to the projection screen (since the orientation would be different).
My only concern is trying to fix that should I sell the house as the texture would never match.