Thanks for the link. I posted some comments. In particular, one about writing in TeXmacs and then converting to LaTeX. It worked quite well (not perfect) and I think such a workflow could ease adoption of TeXmacs: people would not feel that they are “ditching” LaTeX completely and they would be safe in thinking that there is a way to go back to the old, more familiar, workflow. Having the fallback option of going back to LaTeX was surely something that helped me: I started by exporting to LaTeX some notes I tried writing in TeXmacs. It worked so I was not concerned about the transition.
Of course, ultimately, I decided to stick to TeXmacs I mostly do not convert my work to LaTeX. However, for initial adoption I think it is reassuring to be able to convert back and forth.
P.S. BTW, I believe I should note some of the issues I had with the conversion and file bug-reports / questions about it. Will do so shortly