As some who jumped on a few years ago, I found it was very easy to learn to play and eventually DM. Had never played a tabletop role play game before, all I had to do was Google anything I needed to know. The 5e wiki dot has pretty much everything I needed to know, before I eventually bought any...
Because, unless I’ve been reading your posts wrong, you seem to think that WotC are horrible people for pretending a Spelljammer book is coming out, which means you don’t think they’re making one. So I figured a little bet might be fun.
I mean, something different is always welcome, but I guess I’m just confused how your idea isn’t rule expansion. I’d welcome more DM tools wholeheartedly.