Look at satellite images of Gaza. Consider how people there actually live, in temporary tent cities with little access to food, clean water, and medical treatment. Consider also the extent of "accidental" civilian casualties -- with more deaths among Gazan women and children than among Hamas fighters. Then consider that these unarmed civilians are essentially stateless and should, by rights, be under Israel's protection.
How do you see them living in five years? Almost nothing is left standing in Gaza.
It's not (yet) an out-and-out war of extermination, but it is, emphatically, already a profound moral and humanitarian catastrophe -- and a stain upon the soul of the Western nations who are standing by to watch it unfold.