so, been bored and trawling the eve forums, the ship crew debate rages on... and there has been some speculation as to whether it might ever become a game mechanic, or even just be referenced in the killmails and the like... so here's my 2 bits.
while i believe it would help immersion, and in many ways spread the player base out a lot more, especially in high security space, i don't personally believe that, unless it is incredibly hand-wavy, implementing ship crews would work.
they would have to source the crews from a systems inhabited planets, that would produce a base figure to work from, then would come social and environmental modifiers... a wealthy temperate world with good farming, entertainments and tech is likely to have less of a percentage willing to risk becomming crew than a barely functioning backwater....
then there is refresh rate... at best they could feasibly do this once every few months, as new crews finish training... so losing a ship would start to become even more worrying. (and CCP would have to implement a crew loss calculation to ship deaths)
add to that the impact crews would have on nullsec. how many crew are needed for one titan? fleetfights as we know them would be over. losing a titan would probably take months to replenish, unless the crew was sourced from perhaps a whole constellation...