The declaration is premature.
I've been working on the Tizen platform for about 2 or 3 years (IIRC).
There is already a huge amount of work that has gone into Tizen. Samsung even abandoned bada for it. bada itself was a good platform. The API for bada was extremely well written, and far better suited to mobile security than Android.
Samsung is leveraging a lot of different aspects that Apple simply can't. The 800 lb gorilla here is Samsung.
For anyone that has been keeping up even a tiny bit with the semi-conductor industry, IoT (the Internet of Things) is set to blast off very soon. From Freescale and Molex to Samsung and Apple, you'll see a huge explosion in the number of connected devices over the next few years. (BTW - Be afraid. Be very afraid. The kinds of things coming out are nothing short of terrifying. Techdirt will have oodles of material to report on with lots of spill-over for TorrentFreak and JudicialWatch.)
Samsung spent well over $1 million in prize money on an app contest a while back for bada. And they dropped bada. I rather doubt that Tizen will get dropped as easily considering how it's going to be deployed.
That Tizen isn't broadly deployed yet isn't an indication of its demise.
When your watch, TV, and whitegoods (fridge, dishwasher, etc.) are all running Tizen, there will be greater motivation for developers to hop on the Tizen mobile device bandwagon.
Another thing to watch is the automotive OS market. It's extremely closed right now - basically, it's darn close to invitation only, though if you have a great app & business plan, you can submit an application. But the automotive OS market isn't "dead" because some guy writing for Computerworld doesn't think it's going to survive on your phone.
Your phone is just one aspect of the coming IoT.
Things to look at are hardware lock-in gimmicks, networking lock-in (SDK/API), device-to-device integration, etc.
If anyone things 1 bad review is going to stop Godzilla from destroying Tokyo, they've got another thing coming.