The biggest mistake here is when the dude at BlizzCon asked "Is this coming to the PC?" and Cheng responded along the lines of, "Do you guys not have cell phones?"
He should've responded: "Do you guys want this on PC? That's interesting feedback. I should go ask the team, if this is also going to go there; or if we should bring this there."
Yes, a lot of people DO have cell phones. But the thing is: at BlizzCon, you are talking to a PC CROWD. Blizzard was always PC-centic and often released stuff there first, so....they expect whatever announcement to be likely for the PC.
But even Bethesda, of all companies, had enough common sense to know, along the lines of this at that E3: "Well, this mobile ES: Blades games; well, we're gonna release ES: Blades on everything - PC, mobile, PS4, X1." Just like they did w/ Fallout Shelter. They didn't open or close the show w/ ES: Blades, either; it was somewhere in the middle.
Not bringing Diablo: Immortal to PC, it sounds like they are tone deaf to their audience, their PC audience that been w/ them since the original Diablo 1.
Positioning Diablo: Immortal b/t D2: LOD and D3 is also interesting, as this could fill in some gaps in stories and characters b/t the two games.
I am curious about ES: Blades b/c it's a ES game and b/c it's gonna be everywhere. If it comes to PC, and especially even more so if F2P or it's dirt-cheap to buy a fair amount of content - I'm gonna give it a shot. Especially if it does evolve, get better and/or good over time, like some other on-going games getting more & more content over the years have done; especially in the MMO space (think FF14 Online MMO). Some games release and are....meh out-the-gate - but b/c it's living and breathing, they expand on it constantly, revamp, improve, and deepen the game.
Worst comes to worst, PC gamers play ES: Blades and say, "Nope, not for me." Best outcome is: "I can play this on mobile and/or PC; I like this."
Right now, all I can say about Diablo: Immortal is: "Well, this ain't coming to the PC. Maybe I'll go check out Titan Quest: Raknarok expansion, Path or Exile, and/or Grim Dawn."