This is nothing out of the ordinary. Console makers always take a hit on their consoles because they know they can make it up with the sales of games and add-on crap.
i think it will cost the same anything over 50-60 bucks people are not going to buy. 50 bucks is the sweet spot though i dont think it will change when blu-ray comes out.
360 comes out on thanksgiving i believe and i still would pay well over 50 for a blue ray disc cause its high definition longer game play and graphics would be incredible