I think, given the disturbing level of support for Islamism and jihadism (far more support for the former than the latter) among Muslims, even though few Muslims even know what these ideologies really are, it is likely that if terror continues that Muslim immigration be frozen. What is more questionable is whether there will ever be active deportations. I think the UK will be the first place where these issues emerge. After the US it is the biggest Western Islamist target and most UK Muslims want shariah (polling proves this). The UK will never succumb to 9th century Arab/Roman law (Justinian code). Either Muslims will accept the laws and system of government in the UK, the UK will force them out if Islamism/Jihadism continues to run wild htere, or jihadists/Islamists will take over.