Indeed, how could there possibly be a citation for the possibility that his days are numbered? Demanding a citation for a future event does not make sense.
Yes when it's outlandish from the known reality. I don't need citation for "there are people in Russia that don't like Putin" but I need one when "his days are numbered".
I (try to) look at the world like it is, not like I want it to be. Thinking that Putin days are numbered (be it by the people or his security apparatus) is delusional. If it is not, then back it up with something, I have no problem correcting my views when confronted with good data.