I could easily be wrong here, from the article it sounds like the remaining power reserves are only enough to correctly orientate Voyager to allow for its communications link to be pointing towards Earth.

If so and Voyager only has enough power to do some minor rotations of the probe for three more years it's unlikely that there is enough power to actually change its overall trajectory, even if fired all at once.

BTW thanks for your comment, it was nice to hear Carl Sagan again :)