i dont think you should be worried that he said they need to lose the idea that its a video game movie, because thats the main fault most video game movies mess up at, they play off the fact that its based off a video game instead of focusing on the story, or they try to translate the gameplay to the movie instead of the story. they try to recreate the game, not the games storyline.
look at the majority of video game movies, they are nothing like the game (the earlier ones get a little more credit from this though since most early video games didnt really have a story outside of the instruction manual)
in my opinion the fact that he said that is THE BEST indication that this movie has a chance at being good.
world of warcraft has a good story, is it the best story in the world? no but its a good one and it has lots of potential for a movie adaption, i think the main problem they face is whether or not it will be tied into the game itself, if it is they have a much bigger problem because wow is an mmorpg so its being added onto nearly constantly and plans change which means if its tied into the game it either has to not be important at all, retell a story already told that we know pretty much everything about, or blizzard needs to have a solid plan up till the movie is released on where they wanna take wow.
look at the fall of theramore and how because things change quickly it just didnt translate well.
so really we need to know whether its a reboot, a retelling, or a tie in before we can really judge, if its a reboot it needs to atleast have a strong basis in what really happened it cant be "hey there are orcs and dwarves and elves so it must be warcraft amirite?" if its a retelling we need to know whether or not what its retelling is something established enough in wow lore, if its a tie in then we need to be careful because thats the easiest way they could get it screwed up.
the other thing is that they need to market this for people who dont play wow as well so the story they tell needs to both be a huge shoutout to the fans AND stand on its own.
they have a big challenge ahead of them but wow has a huge wealth of lore to pull from and plenty of stories that would make a good movie and it has lots of potential for new stories as well.