In the light of the Conti case the door-to-door ministry is a growing concern. The Watchtower argues that Kendrick was just a "rank-and-file member". Attorney Simmons claims Kendrickwas a minister engaged on behalf of the Watchtower as he went door-to-door. Other court rulings have indicated that "volunteer status" does not exempt organizations from liability.
I can see a challenge being the fact that what started as a normal way to peddle books at the turn of the century has evolved into a brand identity. The field service is a matter of pride for JW's who have the "we are the only ones doing this" mentality. Take away the field service and you lose a key component to the JW experience. Unless you replace it with something else it will leave them rather directionless. They no longer have a mission.