IMO the Tools For Thought (#TFT) ecosystem is crying out for a standard interchange format to break down the silos. Org-mode could be that format. It's not just an outliner format, it's the best markup[1] and supports pretty much everything you need for journaling/task-management/project-management etc.
What's been missing thus far is a single canonical definition that everyone can build on (beyond the org-mode source code). I'd love to see this be the reference implementation of Karl Voits Orgdown proposal [2]. (BTW there was a recent relevant discussion here [3])
[1] https://karl-voit.at/2017/09/23/orgmode-as-markup-only