Since you are not an Airbnb host, let me explain how the calendar and booking process works from the host's end. Simply put, there is no way to offer a refund "contingent on dates getting rebooked." In order for the host to have the space available to re-book--i.e., in order for it to appear on the Airbnb calendar as available--you have to cancel your reservation first. As soon as that happens, you get your 50% back and any other refund that the host decides to give you (it is up to the host's discretion whether s/he will give you any additional refund). The host can't give you a refund contingent on re-booking--s/he either gives it to you immediately when you cancel, or never.

In other words, you don't have leverage in this situation. And you've made it pretty clear in your previous posts that the reason you are looking to cancel at exactly seven days out is to screw the host because you're annoyed that you can't weasel out of a binding contract that you agreed to. So yes, my opinion stands.