well, you may be able to get aircraft safely to the ground in zero vis, but the airport, aircraft and flight crew need to be 'certified' for it to happen.
I was certified to do the aircraft systems verifications on the 737, 757, 767 and A319/320.

more often then not, I'd bet that when you came close to landing then it was aborted was due to something called "Decision Height" (DH)
http://en.wikipedia.org/wiki/Instrument_approach
to sum it up, the runway they're landing on has a DH, the flight crew has to decide at that height if they can see and safely land at that point. IF not, its'a go-around.

There are aircraft that will do everything from takeoff to landing.