The claim system should be kept.

That's all I have to or need to say.

I don't know about the underlying code that may complicate the dev teams attempts to implement PvP and Large scale PvE content due to the current claiming system, but it was not an issue in XI with Besieged or Ballista/Brenner (I miss Brenner by the way, fun times) so I don't see the complications it may present on a game with a similar core engine (based on observation.) While I sure don't want to see the return of Aery anytime soon (different issue though), I would sooner not forgo the claiming system.