I think "permanent" is a pretty strong word for your argument. Matters like assimilation and changing cultural attitudes to foreigners will also have a bearing on the relevance of any anti-immigrant movement, no matter its foundation.
I disagree with your statement that " the greater the size of your Muslim population, the greater the number of nutjobs who will blow themselves up" -- the reason being is that immigrants tend to be self-filtering. People leave a homeland largely because they don't like their lives there, not because they want to export their own values.
I disagree with your statement that " the greater the size of your Muslim population, the greater the number of nutjobs who will blow themselves up" -- the reason being is that immigrants tend to be self-filtering. People leave a homeland largely because they don't like their lives there, not because they want to export their own values.