You know what? This is what happened when Blizzard is taking their sweet times to release their game instead of hitting it when it is hot.
By the time Blizzard releases HoTS, MoBA genre itself is pretty much declining. Now the battle royale is the latest, hottest and popular genre and I don’t see Blizzard doing anything to eat that pie. I guess most likely they are busy to reinvent the wheel.
By the time they came out with a new and unique Battle Royale blizzard game, most likely the Battle Royale fad had died off, and Blizzard is only at the starting line.