VR isn't dead at all. This game sales curve is pretty similar to a console's sales curve. The enthusiasts have all bought it during the first few months and sales have slowed down after that. This is normal and has been happening since video games first went on sale.
People also have to remember that people here in the UK (and I'm assuming in Europe too) haven't been able to buy an Oculus Rift from anywhere apart from straight from Oculus themselves via their website. In the States people have been able to buy headsets from Best Buy, Microsoft Stores and Amazon.
From 20th September we'll actually be able to walk into a shop and buy one or visit the Amazon websites in our respective countries and buy one.
And then in November we'll see a sales increase due to the Touch controllers being released and due to the Christmas shopping season.
And of course one thing that hasn't been mentioning so far is that sales for Oculus Rift software on Steam has actually increased. Probably (imo) because the vast majority of Vive owners have realised that the majority of Vive games are nothing more than glorified tech demos for the Vive controllers. You also have to take into account that a great deal of developers have been working on Rift titles for years - DK1 devkits started appearing in 2013, Vive devkits weren't widely available until 2015 so there's more Rift software available and that software will obviously be more polished for the most part because it's been worked on for longer.
And of course, as other people have mentioned, PSVR is going to be released in October which should bring VR to the mainstream market, and = despite both Sony and Microsoft not owning up to it because it will piss off a good few people when they realise that the 8th gen will only have lasted 4 years - with the PlayStation Neo and Xbox Scorpio being released soon a new console generation is starting. I'm expecting Microsoft to release the Scorpio with some sort of HMD, probably made by Oculus if it isn't an actual Rift.
I think it's pretty safe to say that there are at least 500,000 headsets in homes around the world at the moment. Oculus must have had half that in pre-orders alone.
It's just a load of dodgy websites scaremongering to get clicks tbh.