Pasting external code into a webpage is not a new concept. Before it was the console, browsers accepted a JavaScript statement into the URL bar, so people did stuff like javascript:(function(){console.log("Hi!");}()). Firefox doesn’t seem to do this anymore, though.
Putting it in the console does seem like a neat “modern” version of the idea, though. I think it could take off, but it will remain a niche (as are most indie games, anyway).