I agree
I think the first thing to consider is that "sustainable" can have a lot of different meanings in the educational context. It can mean: a) not going into the red financially b) continually having people visit and learn from your ed materials c) continually building materials on your site for yourself d) continually having others contribute new material to your site. Wiley's definition of sustainability encompasses all three of these meanings individually and in combination:
sustainability will be defined as an open educational resource project’s ongoing ability to meet its goals.
I agree
Good observation
I agree
I disagree: Moodle is not complicated (1st) and there is no need to convert a whole course to moodle or any other forma "at once" (2nd). It is more useful to begin by small "chunks" of syllabus or course and then develop a full versione with the time (3rd), and then it is possible to consider the derived feedback of students themselves, who can develop avtivities like glossaries or quizzes (if given the teacher's role in a precise course of moodle) and this "chunks" of course can be reused in other courses for other students (4th)