Eh. If they decide the burden is too much they can just kill 100 of the hostages right now and increase the value of the remaining hostages without releasing any. Similar to the famous R’ Chaim about destroying one out of a rare set of two coins that doesn’t technically cause a loss because one surviving coin is worth what the pair was originally worth. Overlooking that ultimately, every hostage out is a life saved. It’s not hypothetical. Each life saved is just that, a life saved, not a game.
Not really. If they start killing hostages en-masse it tips the scale greatly in Israel's favor. Hamas is stupid, but not that stupid. Every hostage is a card to play, and playing 100 cards at once with the only value that you won't have to hold it anymore is foolish asf.