I agree, in general.
However, memes have a tendency to mutate and be selected for virulence rather than beneficial payload. In particular, something like "rationalists should win" can easily become something more like "winners are rational" which is... not at all what we want.
I suggest aiming to make people curious about rationalism without trying to attach any useful information about it to compact memes.
"If you're so smart, why ain't you rich" is almost a rationalist meme, and it survives intact. It's also a huge problem because it equates near-immutable IQ and winning, and then uses the obvious wrongness of this equation argue for egalitarian idiocracy. But "If you're so rational, why ain't you rich" is sneaky-good and similar enough to hitch a ride. It asks: maybe you aren't rational enough? And suddenly a scale is introduced.
This has been discussed some, but I don't think it's been the sole subject of a top-level post. I want to find out other people's ideas rather than driving the discussion into my ideas, so I'm asking the question in a very general form, and holding off on my own answers: