A lot of us do not believe for one moment they will find work, usefully integrate, "settle down" or learn to be any more than passable in their hosts language. I foresee them ostracising their hosts, or worse, living in ghettos amid their own, continuing the crime that is endemic in many of their lifestyles, and possibly becoming radicalised and turning against their benefactors. It's a well trodden path and I see no reason anything will be changed with far greater numbers of them in Europe. I see it being far worse, in fact, far far worse.
Your rosy picture of adaptation and "settling down" sounds fantasy in fact.