Being jacked into the Matrix, anything that happens within the system to your RSI (virtual self) effects your real body. Like that old axiom that dying in a dream will kill you in life.
You get hit = bloody lip
Shot = tore up inside
Break a limb = body spasms to break the bone
Die = die
You get the idea.
By the same token, good things effect your real body the same way...which begs the question: what happens to a person if they're having sex while jacked in? I don't suppose operators wander around with spare towels...
The point, or question, I'm dancing around here is this hypothetical; a ship crashes and its operator and pilot are killed but all the other equipment still fundamentally works. The only survivors of whatever happened are all jacked in. Eating within the Matrix, to some extent, staves off hunger in the actual body but without actual nourishment, the body will eventually start to atrophy and starve.
How long do you suppose they could survive like that?