I'm with AA and Mesh on this one.
Especially as Consecrated Ground doesn't "move the zone". It moves the Origin Square. The zone is just given off by the Origin Square. I'd treat it like an item that has an aura being given off, and I'd allow a player to walk away from an item and have the item keep going (as the item maintains the effect, just as the OS in this case maintains the zone around it).
As no range limit is given for how far an Origin Square is able to be from someone it then doesn't fall under the PHB p59 or PHB2 p222 rules and just works as written, and stays nice and easy to use.
Especially as Consecrated Ground doesn't "move the zone". It moves the Origin Square. The zone is just given off by the Origin Square. I'd treat it like an item that has an aura being given off, and I'd allow a player to walk away from an item and have the item keep going (as the item maintains the effect, just as the OS in this case maintains the zone around it).
As no range limit is given for how far an Origin Square is able to be from someone it then doesn't fall under the PHB p59 or PHB2 p222 rules and just works as written, and stays nice and easy to use.