Question: are all the dothraki dead?
Answer: Melisandre magically lights the arakhs of the Dothraki. ... It only struck me later that this scene meant nearly all the Dothraki in Westeros have died — as have, presumably, a large chunk of all the Dothraki fighters in the world, since all the khalasars knelt to Daenerys after the inferno at Vaes Dothrak.