Please don't draw conclusions from inexperience.
A single PKer can not effectively lock down a wilderness boss on one world, much less dozens of worlds. Staying at a boss after you use supplies fighting other PKers or PvMers puts you at a disadvantage against whoever you encounter next.
It actually takes ages to hop worlds at most wilderness bosses. Scanning safespots is a bit quicker, but people slip through the cracks as it isn't thorough.
Few people will bail on wilderness content altogether because of a single encounter. If you hop worlds, your chances of encountering that same PKer are slim.
Just teleport everyone skulled to the mage bank whenever he logs out in the wildy. PKer can still find at least 1 target, but not lock/harass every world.
This is massively inconvenient, makes clan PKing almost impossible, and instantly offers anyone who logs out of a fight immediate safety.