I wouldn't mind reading if someone took a crack at a Sequences 2.0, or something completely different.

One way of looking at the failure mode of Scientology is that they lead with genuinely useful material, which hooks people and establishes them as a credible source of wisdom. They then have a progressive structure that convinces you new epiphanies are just around the corner, you just need to put in a little more effort / time / cash--but there is no epiphany waiting that will be as useful as the original epiphanies.

This happens lots of places. I recall reading about some Alexander Technique expert, who continued doing lessons in the hopes of recapturing the first moment when he experienced lightness in his body. He never could, because the thing that was shocking about the first time was the surprise, not the lightness, and no matter how light he got, he could not become as surprised by it.

The healthy approach is to have a purpose, to pursue a well of knowledge for as long as doing so enhances that purpose, and then to abandon that well of knowledge as soon as it no longer enhances that purpose.

But here we run into the issue that, while rationality may be the common interest of many causes, the "something new" is unlikely to be a specifically rationality thing. It's more likely to be something that some people find interesting and some people find boring, and so the people split into different taskforces to solve different problems. (That is, the Craft and the Community sequence really does anticipate lots of these issues.)