(I'd argue that changing the skin to vector is a strategic decision by WMF and cannot be overruled by local communities - but that's something a system administrator has to decide.)
I'd say the system administrators will do as the foundation (board perhaps? or some other organ) says.
Having different looks on different wikipedias is raising some identity questions, but I'd say that the simple fact that right now en.wiki looks in a way and smaller wikis look differently is a hint that the problem is not that serious. I'm really curious about the outcome of this discussion, be it here or not :)