What a true aircraft designer hopes for is to design an aircraft where there is good chance of surviving initial impact, but has a fuselage that will crack open like an egg and spill all the people into the grass so they can run away before the fire kills them.
If you look at some of the biggest aircrashes in history where there were survivors, the majority got spilled out onto the grass. Very few survivors make it off the plane when there is fire and the fuselage remained intact.
