Just gonna echo other people on this. If they break up the main story into sections and release it seperately then im not buying any of it. They are pushing the boat out further and further and testing what customers will put up with. If the full game is not there on release date (even if it takes 2-3 years to come out) then im not buying it. I refuse to buy an unfinished game and so should everyone else.
What is this, fucking Telltale? I betcha they'll charge $60 for each part, but people will buy the shit out of it because of hype. This is the same strategy that movies like the Hunger Games are using, double the parts = double the money and half the plot at a time :o