If you are referring to NX2000 and NX300 cameras, their firmware is derived from some parts of Tizen code. Only devices (meaning other than smartphones) using Tizen that I know of are Samsung NX1 and Samsung Gear S as Samsung Z was shelved (most likely permanently). Additionally, Tizen is not FOSS but contains many bits and pieces that are under Flora license, which is not compatible with Open Source initiative. Also SDK is closed source. In that sense you are right, there are more devices running Tizen or some derivate - just no smartphones.
You bring up cyanogenmod
And as everyone has been able to see, Steam for GNU/Linux has been working out fantastically well and will certainly not be dropped or 'left in the community's hands' in the foreseeable future. Let's first wait and see how much devices will actually be sold. As to Tizen watches and other 'wearables': I'd be extremely surprised if, in 10 years, there will even be 'smart watches' or any of that other fad nonsense at all, let alone ones running Tizen. 2013 is going to be the year of smart watches! No wait, 2014! Actually, we made a mistake, it's 2015!