I don't think Diablo on mobile is a bad idea. It was just announced in the absolute shittiest way possible. Look at Fallout Shelter. It's a mobile game, but it's actually a fun take on a loved franchise. But when they announced it, they also announced Fallout 4, so it was a bonus to make Fallout 4 announcement even better. Had they even had some Diablo 4 teaser CGI with some fire and Diablo's eyes, and a D4 logo or something, followed by the mobile announcement, it would have went a shitload better. Even if the game is nowhere near being ready, they could have given a few tidbits. I highly doubt this game is in replacement to an actual PC game. That is still in development, and this is done by some chinese company. It's just a side mobile game. Should have never been announced as the grand finale at Blizzcon though.
I'm trying to look at the mobile game itself with an open mind. Yes the blizzcon shit sucked, but I'm willing to give the game a try. Being able to play some Diablo at work or on the shitter or waiting for an appointment etc, would be nice... but that should be IN ADDITION to a good PC game, not a replacement. I'd love to be able to farm loot on mobile that I could use on my PC character, but Blizz would never be innovative enough to do that. I will try this game, and I hope it is enjoyable and not trashed down with tons of IAPs. I'm willing to give it the benefit of the doubt, because really, Hearthstone on phones doesnt do ads or nickel and dime you, so as long as Blizz stays like this, it could be enjoyable.
What I am tired of is all these remakes and vanilla. All I see is "pay us more to do what you've already done before". They made models and levels and an engine for the new WC3 remake, why not just make new characters and a new story? It's lazy imo. I get people love D2, but the whole remake shit seems like a waste to me. I've played it a million fucking times, and yes playing it with a shinier coat would be cool, for a few days, but in the end it's still just Diablo 2. I'd rather have a legit D4. It will come, and I imagine they are taking their sweet time with it after the shit launch of D3. But Blizzard officially no longer gets the benefit of the doubt from me, they are now judged with a healthy dose of skepticism like pretty much all other AAA devs now days.