The SoI change still leaves me baffled but the BH one may have potential.
Tanks receive a lot of overhealing through beacons and HoT's. Wipes (in 10 man) generally don't happen because a tank dies. They happen because someone in the raid other than the tank dies. If BH takes care of low people in the raid with smart heals then the overhealing on the tanks would diminish because the healing is going to the raid rather than the tank.
Of course this is
but I see the potential for this change to be pretty awesome.