Pretty much how I understood it. @pemerton had made this point before, while the OGL as a license, once obtained, is perpetual and worldwide, it still requires you to enter into a contact with WotC in order to obtain it. In order to enter that contract, there needs to be (1) an offer from WotC, (2) something that the contract offers and (3) a clear sign that you've accepted that contract. If WotC stops offering OGL v1.0a (which is separate from revoking the license from those who previously held it, which is what they cannot do under the perpetuity clause), then you can no longer get OGL v1.0a since (1) becomes missing.