Right, I didn't write clearly. After a couple months of pushing to a 1.0, I'd expect maybe a few thousand users (this seems reasonable to me because it's the number of github stars). That's enough though that I'd need to start worrying about the product rather than just the technology, but that could all be done part-time.

My estimate of a million users is what might happen after another year or two of building out the whole vision, and with organic growth from numerous sub-communities (for example, I'd expect Rust users to be quicker to adopt it because it's in Rust). At that point, it's clear that the project would need at least a full time person to be its maintainer. And I don't see how to sustain that.

Thanks for emphasizing the focus on marketing; it is indeed a knob I can turn.