They will select a new primary leader, but they are organized more as a confederation than a centrally controlled group. Very little of their action relies on there being a leader at all. Past Israeli assassinations of their leaders haven’t weakened the group, and I don’t see any reason this time would be different.
It’s important for vote counts to to be independently checked. Having who voted publicly available means an investigative journalist can prove the county clerk’s claim that dead people voted and so they can’t certify the election is false. Or catch attempts at fraud. Both as a double-check on government in the case of officials who are lying or have acquired false beliefs, or as outside help if the issue isn’t caught internally due to under-resoucing.