As of now about 25% of the global population is Muslim and it's expected that Muslims will outnumber Christians (30%) by 2050. Instead of trying to establish a "caliphate", a cynic could look at ISIS through another lens. Muslim extremists have ALWAYS trumpeted their quest for complete, global domination - and have also stated that it may take 100 years. What if the INTENT of ISIS was to instigate a mass exodus to allow the infiltration of like-minded Muslims (not necessarily terrorists or extremists) into Western and vulnerable countries? Looking at it from a one hundred year quest - imagine the increasing population coupling itself with the current trend of multi-party, coalition parties......can an Islamic political party with a non-threatening name be that far in the future? And with a significant slice of the population, could they one day hold the balance of power in a coalition government? And if so, what would the trade-offs be? Far-fetched? I don't think so.