There's currently a site on Area 51 devoted to Design Thinking. (Disclosure: I initiated this site.) It's not growing, but there is some interest in Design Thinking—and a lot of related and potential questions.
Note: By "merge", I mean conceptually, not actually moving data from Area 51 on to UX.SE.
It's possible to make the argument that all Design Thinking topics relate to UX, so they might not merit their own separate SE site. Would UX.SE be an appropriate place to ask questions about Design Thinking? Even questions that don't apply Design Thinking to software or web design? For example, questions about how to teach Design Thinking in a corporate setting, or how to implement Design Thinking in an elementary school classroom—would they be within the scope of UX.SE? (Please forgive—and correct—me if my assumption that UX necessary involves computer interaction is incorrect.)
My goal overall is to find the best home for Design Thinking questions. My goal with this question is to listen to this community's input on whether UX.SE would be a good place for the full breadth of Design Thinking questions. I look forward to hearing your thoughts.