yes, I agree with that completely. patriarchal marriage is not worth preserving. it might be possible to reform it into equal-partner marriage though. we shouldn't expect egalitarian outcomes from total sexual liberation though. some control structures might be useful.
but which ones? we don't have that many good models in history to work from. this seems like a serious unaddressed challenge in society right now. we're in the middle of experimenting with it. messy.