The truth is, even for food allergic people, the risk of death is low compared to other causes. EpiPens are very effective. Also, anaphylaxis is a very temporary condition. If you do get anaphylaxis then after a very short recovery period there are zero long term effects to worry about.
It's questionable whether intensive and risky treatments are warranted in most cases (remember Xolair carries its own risk of anaphylaxis).