Glade Riven
Adventurer
There is a thing (at least under US law) which is implied agreement (example 1: courts assume that if you are using software, you are agreeing to the terms of service to use the software; example 2: banks changing their TOS with customers and ending the notification with "if you disagree with these changes, you have until X date to close your account). So if you publish under OGL 1.1 you automatically agree that 1.1 replaces 1.0a.That all hinges on whether they can in fact "de-authorize" v1.0(a), which is a very open question at this point.
Sure, WotC can try and say that it's been de-authorized and supplanted by v1.1… but can they actually stop anyone who wants to publish under v1.0a from pretending that v1.1 simply doesn't exit?