What caused me to decide not to learn org mode is that it expects me to learn many new "keyboard shortcuts". (I am putting the term in quotes because it is not the standard Emacs terminology for the thing.) By "new" I mean "keyboard shortcuts" that are specific to org mode and not present in the rest of Emacs.
This xiki thing on the other hand seems to have only a few new "keyboard shortcuts", and consequently I would be more inclined to adopt it if I gets more traction (hackers who have tried it and like it).
I know a lot of people here like to do everything with the keyboard, but I am not one of them.
FWIW: Org-mode overloads C-c C-c and tab to the point where just using those two keys you can perform a huge portion of the Org-mode actions depending on your context (including executing code blocks).
I seem to remember that there are many, many keyboard shortcuts unique to org mode.
I distinctly recall shortcuts unique to org mode for moving a subtree up and down relative to a list of subtrees all at the same nesting level -- an operation done by dragging with the mouse in many or most other outliners. I know the dragging interface is harder to implement, but I find it more ergonomic.