Their cash cow might be on life support in 5 years when they release their next gen VR MMO. It could very well be Diablo related and this could very well be the long project they are talking in the last blue post. Can you imagine the noise from the audience if they don't announce D4 this year and instead open with a D3/D2 HD cinematic? They will do worse impression to their show than La La Land best movie award has done to the Oscars - if they don't announce D4 this year they are trolling not only us - this time they are trolling THEMSELVES too, which is costly and they are greedy - a very illogical combination. That said an MMO is not impossible to be in the works atm and the last blue post to be related to it.
diablo is too niche to be a successful mmo after the warcraft mmo ends (which we will see in ten years or even much much later). VR will never gain any attention, it just doesn't add anything besides a big fat price tag.