The healers in my NIM/MM raidgroup are really upset, almost to the point that they don´t want to play any of the old content anymore. Please do all of us a favor and fix this issue as soon as possible or at least give us some feedback on this major problem.
The idea of down scaling everyone to level 70 in most PVE group content, seems to be a bad one in general, with all the problems that come with it. I would prefer, that everything was scaled to Level 75 with the next update.