Doctor Futurity
Hero
Even if most potential players are completely oblivious to PnP and FR, this game has little draw. The DM mode appeals mostly to PnP fans, the campaign story (which I've heard is good) caters specifically to those with knowledge of the Forgotten Realms - not the casual players. So what you have falling back on would be good action gameplay, but truly, Diablo 3 looks 10x better than this game, is much better balanced, has more exciting loot and is just more exciting to play.
I agree it's got a measure of action RPG DNA in it's mix, but Diablo 3 is a different sort of experience from what Sword Coast Legends offers. Real ARPGs like Diablo 3 are fun but they lack substance.* SCL is much closer to tactical and exploratory RPGs in this sense, even if you can play it like it's an ARPG to a certain degree. This game plays closer to how I wished Diablo 3 would have, and I think that there are an enormous number of people out there who feel that way (ergo why Pillars of Eternity, Divinity: Original Sin and Wasteland 2 are so popular). SCL will feed well in to that need, but I'll agree that the fans won't be people who love the Diablo 3 style of play; that's really not the same as what SCL and other isometric RPGs offer, even if there are action RPG similarities.
*to clarify: if Diablo 3 had the "susbtance" I am talking about then we'd also be comparing it to games like Dragon Age: Inquisition or Baldur's Gate. Which we don't, because they are in separate realms of story scope, decision making and complexity. SCL has an auto-attack element and is a top-down perspective, yes....but it's design leans closer to the Dragon Age side of storytelling (or Baldur's Gate side, more accurately) and far, far less the Diablo 3 side, which is a programmed story with no real choice other than to keep charging up your kill totals and unlocks.