However, I see a problem and it might be because I don't understand math at all:
If Servitude buffs the Doomguard/Infernal and they perform better than standard pets, wouldn't that mean Supremacy becomes the only option? Unless they change Service, if you take Servitude, both Sacrifice and Service are unaltered. However the Supremacy's 20% bonus will scale with the Servitude pets and will always be the better choice.
Seems like we're going to see some patch notes that add the Doomguard and Infernal to Service or we're going to have quite a problem with pet talents as a whole.