If someone was involved with w:id:Listyo Sigit Prabowo, how would they find out about w:id:story:This? There will need to be some kind of cross-namespace watchlist, history, and notification listing.
If a user has a page-block on a mainspace page, they should also be prevented from linking stories to that page. And what if an article or other mainspace page has semi-protection or ECP? Will that apply to linked stories?