It's on the protocol designers and promoters to determine what it ends up being of course. It seems like a bit of a mismatch to me right now. The client cert support as the exclusive way to identify users is a really cool feature of the protocol IMO, but it doesn't seem like it's very useful without dynamically rendered pages. It's certainly possible to do dynamically rendered pages now, but they're also of much more limited use without the ability to send complex data to the server using the same protocol.
Given the aggressive anti-complexity stance of Gemini, isn't that supposed to be a feature? A messageboard isn't a static text document, it doesn't belong there.