I mean, given how popular D&D 5th edition is right now, and the prevalence of D&D streams, Blizzard could probably reintroduce a D&D 5th edition version of Warcraft races, Magic Items, and Setting info and it would likely sell very well. Especially if they partnered with Wizards of the Coast, or some other group, or even just published it as their own completely third-party stuff.
I mean, I’m running a D&D campaign set in WoW (post 4th war) and it’s been quite popular among my player group. It has to be at least as popular as the Magic the Gathering setting books that they also publish.