The problem I see is...right now...you don't hear Raiders crying about PvP gear...because...it's not really viable. Now imagine if they got rid of resil...now the PvP gear is on par with the Raid gear. It would have to be...otherwise...you're forcing PvP'ers to PvE in order to PvP.
Resil on gear allows PvP gear to be specific to PvP. It allows PvP gear to be "good" for the purpose it was designed...while not infringing on the PvE communities arrogant attitude that only the best gear should be available to those that raid.