Dr. Peter Hammond did a study on this. The tipping point occurs once Muslims reach about 5% of the population. That’s when they start to demand more and more, and include threats if they don’t get their way.
The full study is here:
https://virtueonline.org/what-islam-isnt-dr-peter-hammond
Oh, and one more thing. Many studies have shown that children of Muslim immigrants are usually more radical than their parents. So time will not fix the problem. Here’s one such study:
https://www.telegraph.co.uk/news/uknews/1540895/Young-British-Muslims-getting-more-radical.html
Muslims will NOT assimilate. They came to conquer. That’s something that starry-eyed liberals just don’t get.