Have you done simulations of gp/hr of the expected loot following the changes/removal of emblems? Assuming the scroll and key prices stay constant.
Emblems were literally the only reason I did wilderness slayer, I loved getting that bonus drop. I already have herb sack and slayer helm so didn't care about the points anymore.
That's impossible given no one knows what the value of Dagonhai will be. We'd prefer to wait and see for that reason and adjust as necessary once things have settled.