Possible changes:
*Increase Blood Presence's stamina and damage reduction contribution from 8% to 12%.
*Increase Blood Presence's armor contribution from 30% to 45%
*Make Blood Presence give the 6% Critical Strike protection in all specs.
*Increase Death Strike damage in all specs (Except Blood. Blood hits hard enough already).
Possible results of said possible changes:
*The QQing for Frost tanking ability stops, and Frost/Unholy will be able to tank. Albeit inferior to Blood. Sure people will complain about Frost being under Blood, but Frost sucked compared to Blood in WOTLK as well, and that's what they want back apparently. /shrug
*Makes a good step toward increasing the defensive capabilities as a Blood Tank.
*Solves the arena issue of Death Knights qqing about getting ripped apart. Smart DKs will, and already do presence dance. Bad DKs will stay low.
Simple changes imo, solves a lot of problems that the DK Community complains about. (I don't complain about this stuff. I ultimately think we're fine atm, but I won't say no to buffs)