What's the point of question marks. We understand questions from the order of the words alone, and when there are ambiguous sequences — like "How ugly is he" — we tend to know what we're looking at or can figure it out, just as we can figure out when we are dealing with irony or with a rhetorical question. Proposals for an irony mark — ⸮ — and a rhetorical question mark — [?] —have little traction. I think the drift is in the opposite direction, at least in my experience, as I am continually rereading my writing and finding questions without question marks.
ADDED: This post should have been titled "Questioning question marks."