I am completely against you taking away set bonuses already earned. With the current state of the game you should be nurturing core players - not poking them in the eye. There should be a way of grandfathering in those that have the current sets/partial sets. Even making a FoA like in Testlive for a few weeks then petitionable after that?? If your genuine and only reason for the runes is to allow the T6 sets room to breathe then this should be no issue. For those that have been grinding to get the sets and have yet to kill K then this is a huge slap in the face. Yes, increasing the drop rate for weapons would help but this has been discussed for a long time anyway....
From this point on then you can make the pieces purchasable without disenfranchising too many players - but taking away what we have already been grinding for - and set a target for an additional 90 - extremely not impressed