IS&#x27; successor would not be a territory holding aspirant state, it would have to be more like AQ - which we have already significantly degraded.<p>Now there is the interesting concept of the rise of the &quot;lone wolf&quot; or individual cells that don&#x27;t really have central co-ordination. Would Western intervention in Syria cause more of them? Would their rise be countered by reducing or removing the ability of IS to generate attacks? There&#x27;s a debate to be had.