Can cameras and LCD screens replace cabin windows?
Note that the windows are a safety feature: You need to see outside in case of emergency, e.g. to know which side of the plane is surrounded by flames, or how deep in the water you are. This is actually the reason why the inner lighting matches the outside conditions for take-off and landing and the window shades have to be open. Even worse, the potential rescuers need to see inside to know the conditions in the plane (flames, smoke, attackers, debris etc.), so you would need to have some system that reliably works both ways.

I don't see how your hypothetical plane would get certified with even more emergency features relying on electricity and on something that's basically an entertainment system.