What asians, or the white middle class for that matter, want is not relevant. The economic elites want mass immigration to supply dirt-cheap labor. The big-government political elite wants a compliant third world voting bloc. The fact that our borders remain wide open almost 2 years after 9/11 shows just how powerful the special interest groups are who want this continued flow of immigrants. Not even a massacre of thousands of americans can stop it.
So, no, I don't think that the asians want a zimbabwe-type arrangement. As to whether they will live in walled compounds with the remnant white population....i'm not sure. It depends on the demographics. In Hawaii, the Asians are the absolute majority, and they generally have a negative, hostile view of whites and frequently discriminate against them. In those areas where the asian population is smaller, they will probably integrate fairly easily with the white minority ex-pats.
I'm not so sure, by the way, that zimbabwe is a good example. I don't think that the same level of antagonism exists between anglos and mexicans....so I think that the analogy is more like the anglo retirees living in various mexican cities. They have nice lives down there, generally speaking....but they don't have political power and they don't have the same protections and freedoms that our limited government Republic used to give Americans.