Don’t over-index on this particular answer being refutation of your hypothesis!
I came to LessWrong via HPMOR, and I’ve thought in the same vein myself (if HPMOR/equivalent = more incoming rationalists, no HPMOR/equivalent = …less incoming rationalists?).
Yes. Somewhat, yes.
In the ideal world, EY and others would launch into writing fun and interactive fiction!
That’s probably not going to happen, so in the real world: be the change you want to see.
If you think it’s a good idea, and you have the time and the inclination to do it — do it :)