The Blu-ray pickup probably cost's little more than a Plain CD/DVD pickup but is one of the consoles biggest assets. Without it sony would never be able to sell a game to these console owners and thats how you make $$ so its an instant fail.
The best Sony could do is replace the HDD with a small Solid state drive ie 8Gb ,and continue component shrinking till one day they can make a profit on HW.
PS3 number 1 fan