To fanboys its a win or lose situation, to a business its expanding a games user base. There are a lot of ports to PCs that majority don't care if its on PC. Titanfall sold over 2 million units on the XB1 alone and doubled that of the PC version. Does porting your key franchises to the PC format effect your hardware? No. Consoles will continue to sell to the casuals, no 15 year old will go and build a PC to play video games.
To Microsoft its a win/win situation, they own both formats so there gaming division will continue to grow regardless of format choice. Fable Legends being an online game will only benefit from the multi formats its available on since MS revealed cross play. The more the better. I own a gaming PC but ill be buying Fable on Xbox because I own all fables on Xbox. Everyone is different. There's no such thing as losing an exclusive to your own formats.
Vita ports didnt effect PS3 sales.
