A.K.
My daughter is 19 months old and also has her toys in the same room as the TV. She too wants to watch Elmo constantly. The only suggestion I can offer is to take him out of the room or even out of the house. I know you said moving his toys to another room is not an option but why not take him to a Children's Gym or a trip to the mall, or anywhere that's out of the home and away from the TV. Otherwise I also think it might just be a phase, becuase my daughter would constanlty ask for Elmo until about a week ago...now it's only every so often. All I can say about it is atleast she's watching something educational. Good luck!