I think Andrea is going to take over as leader of Woodbury. She isn't a weak character at all. She was attracted to the life she thought Woodbury was - a protected, civilized oasis. She knows differently now and I think with a little time she will rise up as a leader to bring the two groups together in an alliance. Rick and the Governor are proving to be mentally unable to lead all while Andrea has been shown as able to motivate and calm the people.