Planetary exploration is probably the largest (or easiest anyway) public outreach program for NASA outside of manned flight. The common public usually doesn\'t get excited about aircraft research and Earth Science. It\'s what I meant when I say \'dead\', it would be dead to the public. No manned flights, no planetary science, no hubble, no more rovers. NASA would have lost what little public attention it currently has. And with no public awareness the politicians funding it wouldn\'t have a fear of losing rep for axing other NASA programs.