What do you think would be the response of mankind if magic made a come back? Not in the sense of illusions but in the sense of real powers which defy any scientific or rational or physics laws.
I'm wondering because the plot line of Game of Thrones, as I understand it from watching the TV show, hints that dragons, white walkers (who're a kind of undead I gather), spells, curses and even perhaps an assortment of deities, are all making a come back, now the viewer knows that the white walkers emerged and are encroaching upon mankind's living space from the beginning of the show, while the characters, at least one of them, speculates that there is a triggering event, the resurrection of some dragons from fossilised eggs, there are other characters who seem to bare that notion out, saying that their prayers were never answered before but they said them out of habit and one day they were (resulting in the resurrection of a man, a number of times).
I think I also recall a story or film in which the emergence of gargantuan sea life, like prehistoric giant sharks or squids, from a huge cassum in the ocean leads to a reliance of flight and disruption in international shipping and shortages as the age of sea monsters returns.
There's a couple of Poul Anderson books which deal with different worlds in a multiverse, some of which were always magical, some of which became magical once more and some are not magical, all related to the properties of iron and its lethal nature of magical species and powers.