Addressed briefly here my question is:
Should we ask questions that might not have an answer at this date? One could interpret that as holding out for users, research or opinions of the future — skating where the puck is.
Stack Exchange and particularly Stack Overflow is becoming increasingly prevalent in Google search results.
When Googling, I've often come across SO/SE questions without any answers (usually some comments, or at most an incomplete answer). This network is becoming an important resource to new users — and who knows, maybe some of these new users may chime in with a partial answer.
However, asking questions that "cannot be reasonably answered" at present could clutter the site. But marking them as "closed" could scare off new users and interesting answers as time goes on:
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.
While that invites edits to an extent, perhaps a new flag may be useful in these cases?