Nah. Muslims assimilate better in the US than anywhere in the world. They're too busy making money and providing for their families.
I am understanding you to say that they are okay so long as they don't take their religion and it's requirements too seriously. But what happens when they decide to start taking their religion and it's requirements seriously?
Of course they won't rock the boat while they are in the minority. But we see time and again that when they attain sufficient percentages of a population, they suddenly develop a new found inclination to push a little harder at getting their religious preferences adhered to by everyone.
The concept of "equality" and "tolerance" are alien to Islamic teaching. The whole system is a big socially stratified pecking order from the lowest slave, all the way up to the Monarch, and beyond him to Mohammed and Allah.
Slavery is acceptable in Islam. In fact, it is a virtual requirement. The slave trade here was pretty much fed by the Muslim slave trade in Africa. (Which is still going on today)
Islam and it's teachings are incompatible with Western Civilization. We will have one, or we will have the other, but we will not see them both existing peacefully together, for long, and only then so long as the Islamic portion of the population is small.