The only way this will ever happen is if this weapon skill does not give the user any kind of advantage over players who do not have the weapon skill. SE has bent over backwards to prevent class exclusivity in endgame content. Heck, they ripped out the whole elemental wheel by the roots to prevent even the slight advantage that a class with an elemental ability might have even the slightest advantage over one without.

I could maybe see them "glamouring" weaponskills; like, if you have this sword, Circle of Scorn takes the appearance of lightning bolts instead of beams of light, with no change to damage type or potency. That kind of thing could be possible.