Hahaha. Take a look at western Europe. Vast majority of the immigrants from neither Africa or Middle east didn't adopt any of the core values of their host country even after decade+. More often than not, even second generation has very different values. What happens is isolated or connected silos of original values surviving a lot of generations.
Just ask Germans or French or Belgian folks, or go there. The idea was exactly what you write, and it failed miserably with no solution in sight.
Just to explain - we have friends among those communities. We like them a lot, but the difference is there even after couple of generations. Its not talked about much, but if you look for it, it shows up. Nobody will talk about this with strangers of course, thats just polite facade.