I mean, I'm not gonna defend what the Diablo series has turned into, it's a horrible cash grab. An artistic and moral sinkhole. But *flop*? Blizz is making BANK on that shit. Gambling addict whales dropping $100k on video game characters. Takes a lot of $70 traditional AAA game sales to match a single one of those people, and each server has at least a couple dozen spenders on that level. That's just on NA servers, god only know how much the Chinese players are dropping. Blizz or Netsleaze or whoever's in charge are making nesting-yacht money off that shit. Their yachts have other yachts inside them, you get me? The greatest Patreon milkers in history might as well be rattling a tin cup with a "please help anything will do god bless" sign by comparison.
As for development in SC... honestly I'm OK with it. They really wrapped the story up at a great point at the end of LotV. Given how shitty a job they've done at developing the story for D:I and D4, I'm hesitant to propose Blizz try to make SC3. To do so they'd have to untie the bow they put on SC2, and I just don't think they still have the creative and narrative chops to make a worthy successor. Blizz has turned into a scam engine and it feels like the real talent left a while ago. All they know how to do now is sell people skins and lootboxes and make billions and billions of dollars.