Actually, it’s already substantially easier to hit a higher level player in PvP than it is to hit an NPC of the equivalent level; though perhaps not to the extent you had in mind. On the same token, PvP is only really intended to be a reasonable challenge between characters that are within a few levels of each other.

Gaining levels should confer power, and it’s not at all untoward for a higher level character to have a significant advantage over a much lower level character. If one wants to beat a higher level player in PvP, then it’s in their best interest to gear up, study up, and deliver a satisfying beat down once they catch up. (Source)