who can say?

who can say?

No one really knows (to truth about or answer to something). A: "What does the future hold, now that you've left the music industry?" B: "Who can say, really? I've always been interested in writing a novel, so I may pursue that." A: "Why on earth have they decided to go this route with the new software?" B: "Who can say what convoluted analytics they employ to come up with their new designs?"
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who can ˈsay (...)?

(spoken) used to say that nobody knows the answer to a question: Who can say what will happen next year?
See also: can, who
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