I think if there should be world PVP, it should be relegated to its own set of zones. Think something like Cyrodiil from ESO, only without the infinite loading screens and shield bash dps.
Yoshida is already taking a similar philosophy to DAOC with regards to PVP. Keeping a separation of PVP and PVE falls in line with that philosophy.

But I see why people would like World PVP. Some way to get to a PVP scenario that doesn't involve queueing for an instance would be appealing.