They already had one when they had just 5
Or even one as kayjay correctly points out, for WoW. It did actually evolve out of that one.
The makeover was completed when somebody yelled we all have a phone. Let's be real. Diablo 4 is the last hope for anything with substance, but honestly, if you look at D3, you have to wonder if that's not just wishful thinking as well. The talent has gone to greener pastures, or its still in there somewhere but doesn't get a chance to do something useful. And we saw a teaser and some footage, but I question how real it actually is. Since then it was silence.
Blizzard now floats on seasonal releases/passes and infinitely chewing on what they already have to spit it out at us in yet another game update. If they make something new, its zero depth, easy competitive bullshit. Even Starcraft 2 was thrown off the bus, pretty much. The last expansion, yeah, it got released, but did anyone really care? I pretty much missed it... just didn't care. And I really am an RTS/strategy fan playing the franchise since it started... WoW... for all the game it is, is really just a glorified seasonal update too with its expansions, everything is an overhaul now but in reality you're still mashing the same buttons you did ten years ago, and on a tightly organized tierbased treadmill too. You could ask how open the world really is, after all 95% isn't actively used anymore.
Nah, I think we have to get past believing this will get better again.