The Occupy Bostonians will eventually lose their foothold on the Rose Kennedy Greenway. No protest lasts forever. But Daylight Savings threaten their station even now. Darkness falls over their camp by 4:30 p.m. There are not enough street lamps to see them. Tonight their tents resemble small mountains of black plastic. Only the police are really visible at the perimeter with their bright green vests. I fear that these Occupists will be forgotten in growing cold and shadow.