Skyrim coming 6 months after BOTW (since they're in a similar genre) and Doom coming out with no FPS competition in the holidays are going to be great sellers, I have no doubt about that. Also Fifa releasing pretty much at the same time with PC/X1/PS4, Ubisoft with the Mario+Rabbids exclusive crossover, this is how you support a different platform in a smart way.
I don't think Doom will be that (29.99) cheap, but a 50 pricetag instead of the usual 60$/70 would surely help boost initial sales, then if the port is good word of mouth will help more, since the game is an absolute masterpiece.
I won't buy either of these (already played Doom and Skyrim and not interested in Wolfenstein 2) but I really do appreciate their efforts.