The big difference is that the terminal app doesn't have an editor so I'm not sure how something like that could ever work as the editor itself would need to be able to read the database. Sure, somebody could probably write something like a vim plugin with the data API to implement such a thing but currently what happens inside the editor is different from outside.
I suppose a case could be made for a function that appends the markdown link to the end of the note outside of the editor but personally I think so long as the ID can be easily copied to clipboard then it eliminates most of the issues.
I've put it in my big list of desires for the terminal app - Terminal app feedback/improvement ideas