3D hype is going to come back soon, and it
will stick - but instead of being in TVs, it'll be in VR headsets.
It'll stick because 3D is inherently available in VR headsets, so there's no need to have a "3D VR version" and a "normal VR version"; if you're targeting VR at all, you might as well use its 3D.
I think VR will (given time) succeed, because VR has a couple of benefits aside from 3D - first up, you get infinite screen-size.
Second, it's more portable than basically anything else can be; even laptops are limited by their screen-size whereas future VR goggles could potentially fit in your pocket.
Third, it integrates "companion apps" much better than a smartphone can, due to AR capability - you don't need to keep glancing between your <smart toaster> and your phone, you can just open up the toaster-VR app and look directly at the toaster.
To be fair though, VR might skip a decade before it truly breaches mainstream (e.g. it might be simply too expensive with current tech, when a smartphone can be bought for <$100), although I doubt it. I think VR will become mainstream by 2030.