Because they have not done that for the last decade, do you think it's 2006? You are talking about the Blizzard from 1996-2005. For the last decade Blizzard has been regurgitating their own IPs. I'd love if they can go back to their roots, but for now I'll stay doubtful.
Reworking their IPs isn't quite the issue though. Hearthstone and Heart of the Storm use old IPs, but they're entirely new game types for Blizzard and use that formule(one copies MTG, the other Dota/LoL, but rework them in Blizzard fashion). I think for Overwatch, they HAD to use a new IP cause they wouldn't have had enough variety using existing characters especially with Warcraft/Diablo universe not lending themselves too much to FPS(some chars like Sylvanas or the Demon Hunter would easily obviously, but a lot just don't fit well) but IP aside, it's the same formula.
And it is a good point, sure everyone knows that, everyone but the guy who originally got quoted who said something like "this is so new", when really, it isn't. Even the idea isn't. There's a bunch of mmo/moba-like FPS, in general most modern FPS even are class based and shit, which give you specific "abilities" in the form of guns. You can argue using abilities is different, but there's still games like Global Agenda(bunch of actives for every classes, the pvp part is very much similar), Warframe(I've never played this but the classes seem very moba-like and I believe each have several activable abilities, the game is about coop pve though I think) and more recently Nosgoth which uses asymetric teams with specific classes with a bunch of abilities. Add TF2 to the mix after all the updates that add bunch of different weapons to each class that change their gameplay a lot(or slightly) and yeah, it's not original shit by any means of the word.
But no one should have expected originality from Blizzard, in terms of gameplay or game design. They just take a bunch of every game and mix them in their own little cocktail, with a large serving of casualification to top it off. The only originality in this is the characters, and even that is for the most part extremely overdone cliches.
Regardless, I don't think it's an issue though. I don't need a radically new type of game never seen before to enjoy it, I just need for the game to be good. And I would say it's the same for most people.
