Unfortunately, the majority of smart people don't believe that improving their own rationality is worthwhile (related to point 1 above).

The phrasing you use implies a conscious decision. In an over the top manner you might imagine a person who gets mind-saved, trained into rationality+, presented with all the data on how that influences their lives, and then decides to get memory wiped back to the safe point (and time transfered too). That would be a conscious decision under full information. Obviously that is not the case. I think that the idea that there is more in the world that is amazing and useful and worthwhile to learn is not particularly widespread. So any information about this topic gets possibly discarded by the very same system it tries to improve. A bit of a bootstrapping problem. You might get around that by carefully selecting people with good preconditions, or by a wide spread of the material. The rest of the world might only notice if many of those who participates a certain training becomes successful, and if many of the successful people did a certain training program.