No, there's no need for Disney to offer free food to DVC members. We don't need to be encouraged to book rooms in "slow" periods, and by being members we are already getting a substantial discount on the rooms we book. Free dining exists to entice guests to pay full price for rooms at times of year when many would ordinarily not consider making a trip to Disney World.
For these reasons, free dining has never been offered on DVC reservations.
DVC members are as welcome as anyone else to purchase a full price room/tickets package reservation with free dining (and bank our points).