As I understand the devs want to come with a full overhaul on Pale Master SLAs, since they feel too powerful to allow metamagic on something that does not require mana.
IMO consuming health is the same as consuming mana, since you have to spend mana to recover the lost health anyway.
But this is a discussion for later..
What I ask now is to give us metamagic at least for some time. I mean, let Pale Masters enjoy their SLAs in U29 for some time, and then later you guys can come with new mechanics. Easy change (just do the same as you did to Archmage), and won't hurt anyone. So, why not?