i think the demotion of kvyat has more to do with promoting and locking up verstappen and his (IMO) unquestionably superior talent, than the blunders of kvyiat (even though they were bad).
the crashes just gave RBR an excellent casus belli to do the swap earlier rather than later.
i might be wrong, but i think max will repay them in spades, while i am not sure kvyat has a secure future in f1. He does has some talent, but so do a bunch of other drivers, currently with or without an f1 seat, but his biggest asset is that he is russian and thus worth a ton.
was very surprised by the poor form the ferrari displayed in quali. I like ferrari, but at this point i am afraid red bull might have passed them (while mercedes is just on a different level atm)