Two important things happened recently, the caliphate will not be much longer.
Iraqi forces enter Mosul mosque where Isis declared caliphate
Iraqi forces close to seizing control of Great Mosque of al-Nuri, where Abu Bakr al-Baghdadi proclaimed himself Isis leader three years ago
https://www.theguardian.com/world/2017/jun/29/mosul-mosque-where-isis-declared-caliphate-has-been-recaptured
http://www.aljazeera.com/news/2017/06/iraq-army-seizes-ruins-mosul-mosque-isil-170629101924765.html
Russia's Foreign Ministry has said there is a high degree of certainty that Isis leader Abu Bakr al-Baghdadi is dead.
https://www.independent.co.uk/news/world/middle-east/abu-bakr-al-baghdadi-dead-latest-news-isis-russian-airstrike-islamic-state-a7802796.html