I dont see any problem with games going to PC as long as they make it clear when the announce the game like they did with Ori and Titanfall. I have Xbox One, PC and PS4 so I am covered but people have a right to know which platforms games are coming to from the start.
As for Fable Legends its a huge + that the game is also coming to PC because with Fable Legends being a multi player based game the more people playing the game means larger commuity of players and better over all life of the game.