Because it is one of the greatest RPGs, no scratch that, games ever made. The story kept you engaged for the whole game. It had great character, settings, and humor. I think the main reason I want a remake, is to explore the huge world and cities/towns with free camera control, with maybe an option for the camera to repilcate the camera placing of the original. I also want an option for the combat to be either turn based or real time. That way you can satisfy both the WRPG and JRPG crowds.
And while I know this would take time, it would definitely be a wise investment. I think having Nomura as the director would be a wise choice, too, since he played a part in making the original. I also think it would be wiser to wait and put it on the PS4, maybe as a launch game, so the environments wouldn't have to suffer for any of this gens limitations.