It’s not lazy. It’s selfish and cynical. It’s not about not wanting to do the work. It’s about recognizing that if you are a native, a member of a dominating majority, multiculturalism is not going to benefit you. Since it requires mutual compromises you can only lose because of it. So why should you want to do it?

Yeah, that’s accurate, but I’ll phrase it in a more general way – it’s about the groups’ right to self-determination.
You said that “cultural change should take place organically”, I’m taking it further – I think the initiative to change should only come from within. In the case of the native/non-native dynamic, natives are not required to do anything, not required to make any concessions. Why should they be?

Based on that principle I wouldn’t support the white South Africans’ right to vote. They have no right to tell the native people what the natives should do with their country. Unless, of course, the natives decide on their own to expand the non-natives’ rights. I apply that reasoning whenever it makes sense to speak of nativity.