While the recent leak of ISIS information will certainly help put an end to ISIS as a group, they will leave behind a thought process and way of life for their followers to live by. ISIS wants to put and end to "western civilization" as we know it and convert every last human being to the same ideology as they follow.
No, I do not think the recent ISIS files leak means the end of ISIS as a serious threat because the terrorist organization still controls larges areas in the Middle East and also governs a city the size of Philadelphia. Although the files leak weakens ISIS, I believe that more military measures need to be done to cripple the organization.
No, the recent ISIS files leak does not mean the end of ISIS as a serious threat because ISIS still controls large areas in the Middle East and is still actively recruiting people all over the world. Although the ISIS files leak does cripple the organization, the only way to thoroughly defeat ISIS is by launching more drone air strikes and training local Iraqi troops to defeat the terrorist organization.
No, it will put a strain on the organization for some time but they may find a way to get around this leak. While the documents showing perspective members and their information while provide great resource for the intelligence agencies around the world in assessing possible new members, the group will likely change their methodology or at the very least change its data housing from digital to paper to avoid being hacked.