As a TV exec in the States, when looking at which shows to greenlight, you must go back to the well and remake something that someone already did once and that people already like so that there's no possible way it can fail. If you did something new and original it might not immediately do well, in which case it will be deemed a bomb and you'll lose you job! No no... let's just take a film that people like and buy the rights to that and make it into a TV series OK?