My take on it?
The market is dying because no player has stepped up and provided all things to all people.
It's funny that you can buy a Blu-ray player from all the "big names" ... but other than Oppo it seems like none of the rest of them want to take a chance on media streamer capability.
Far too many formats to support - the cross-matrix is too large and if any of them have bugs or aren't supported well enough, customers complain and the manufacturers go silent and there is no support (hello, eGreat).
Popcorn Hour seem to lead the pack but I cannot buy one in a store or from an on-line place here in the U.S. - why? Competition brings the price down; right now there is none so if I want to buy a C-300 the only place I can get it from is PCH themselves, pretty much - which means they get to charge full retail price.
I had high hopes for the Boxee Box because the software/UI on most of these devices is dreadful (an afterthought really) but they are crippled by fundamental bugs in the Intel chipset and things like HD audio bitstreaming drop-outs ... I won't buy a box that has fundamental playback issues like that!
I looked at the new 3rd generation Apple TV but that seems to be crippled (8 Mbit/sec. bandwidth limit???) as well ... plus my main interest is in playing my own local files, not streaming ...
I may just end up buying a new Mac mini and using it as an HTPC ... but I thought that Sigma was known for being better video quality than using a computer with the standard nVIDIA/ATi video chipsets ... not to mention supporting more format types ...
It's really a very sad situation - here we are with a fundamental need (i.e. play back our videos/music/photos etc.) and no one is the 'champion' ...
So I guess it's not surprising that the sites covering NMTs are mostly dying away as well ... (except for that one site we all know so I will not mention it by name