Yeah, I feel like it’s going to take both browser vendors shaming sites once a standard is developed/finalized and something like a quantum version of whynohttps.com to drive adoption.
The problem really is the store and decrypt nature of it. It could be used against old data so the time when it needs to be implemented is before it becomes possible to decrypt. I feel like people aren’t good about planning like that and tend to be more reacting to what is currently possible.