I think what is likely relatively easy is making a game run on PC. But porting a game to the PC isn't simply making it capable of running on the PC. There is even more then adding all the options that PC FPS players have come to respect. I don't think the fear of PC gamers destroying Console gamers is even that pravalent, especially with matchmaking being able to fit players with similar skillsets together. There is designing the game to be demanding and skillful with the inputs and skillsets common in both Console and PC FPS gaming. There isn't really any shooter that has run well on PC and console when you think of it. There is no shooter that is highly regarded in both hardcore PC and Console shooter communities. And shooter communities can still respect other shooters with different skill sets, so that isn't the reason. Quake and CS players respect each other even though they play very differently. Quake and CS players don't respect CoD or Battlefield. CS and TF2 were made for the console and were pretty unsuccessful. No one has bridged that gap and saying oh, its easy for Bungie to make Destiny a good game on the PC is rubbish. It would likely take a shit ton of work and probably isn't worth it.