Video released by Israel purporting to show Sinwar’s final moments was met by his supporters as a rousing example of their leader’s battlefield bravery.
This isn't a win for the Israelis who wanted a ceasefire or the hostages released. There will need to be a new leader to take over before negotiations can resume and chances are good they'll be even more radicalized against Israel.
And as their assassinations keep pushing the leadership lower and lower down the organizational structure there's less likelihood whoever is around by the time they negotiate will have the influence to actually command people to cease fighting.