The media room does have windows on one side. It has a view so I hated to get rid of those windows. The TV will be far away, plus I plan for blackout blinds - I should be able to get complete darkness. So anyway, if I had to convert the room into a bed room later, it would be one massive room unless I wanted to install an additional door and window. Incidentally, they incorrectly added additional windows to the room, that they later had to fill in. I don't know if that would make it easier or harder to make into a window later. My hope, though, is that I would find a buyer that would value a media room. I just wish that appraisers would not value bedrooms > media rooms.
To be honest, the missing bathroom would be the bigger issue, as the house only has 2 bedrooms, and if you added another bedroom, there is not a bathroom anywhere nearby.