"Ten more years..."
Maggie and/or Daryl kill Rick (and probably others).
The children of all involved grow up with hate/resentment for the others.
A time jump here and there, and we'll find ourselves 20 years down the road with Judith and Rick & Michonne's new baby going to war against Herschel Jr. and a 60 year old Daryl.
And you all thought this show was over... MUAHAHAHAHA! NEVER!!!!
What is it they say on Game of Thrones? "What is dead may never die..."