I always thought the Fury would have a short life, but I don't want to see Vega go in at that kind of price point. It would still leave a big gap between the 480/490 price wise. Ideally, I'd like to see Vega take a step down from where Fury is now, leaving Nvidia products looking very overpriced and Vega offering powerful performance at the £300-350 mark.
Per Fiji, there will be different products based on it, even if there is only one chip. There are likely 3 different discrete cards based on Polaris 10 coming too, as an illustration.
Nanos have sold for as low as £335, vanilla Fury £325. It's not only Fury Xs. It's NVIDIA with the huge price and performance hole in their portfolio, not AMD.