Possible. I have no idea how much electricity they save over a regular TV. I would suspect that it's not enough to pay for the TV over any reasonable length of time, but I could certainly be wrong.

And if they were interested in saving electricity, the AC wouldn't be cranked down to 58 in the room every time I check in. I'm exaggerating, of course, but almost every room is pretty cold when I get there. I actually enjoy this, but energy efficient, it's not.

I have seen a couple of places where they're mounted on the walls, which is a nice space/counter saver, and I'm all for any space they can save in the rooms.

I wouldn't try to discourage Marriott from putting the flat panel TV's in every room, but I just don't see the benefit if you're going to cram it into the same armoir as the tube TV and not have HD programming. I'd just as soon not see the cost of that passed on through room rates.