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Would you let them be if they said they didn't want your land either? Would you let them keep their houses where they are, not pay any taxes or abide by your rules? (And if this was ever an option, how would they know the next generation would keep your word?)

Probably not. Why would you? That's why the only practical way out, as it seems right now, is physical isolation and the establishment of another country.

It may cost you to let current taxpayers and a few children born into a slavery (that you blame on the decissions of their parrents or earlier ancestors) go, but it will be a whole lot more effecient for you all if in the long run if you stop forcing integration.