It's not a buff when you replace something "useless" by something equally "useless". People weren't taking FitG despite it's usefulness and they won't take eternal life either simply because there is no reason to take it at all. Some people seem to think that eternal life will grant 20% LF whenever you leave the shroud, It most likely won't. In the end the trait will just be perceived as a trait that give prot when entering shroud and players will simply discard the idea of taking it when they can take free 30% crit chance and more crit damage. Its not equally "useless", so its a buff for bunker necro :)