Even if K1 was 100x more powerful than 780Ti, Shield had 4K screen, and you could stream every single 3rd person shooter at 4K with 0 lag, there are 3 aspects that can't be overcome - controls, screen size and usability.
1) Without a controller, any serious gaming on a tablet is reserved for causals and kids. You cannot brag about K1 running HL2 cuz without a keyboard/ mouse or at least some kind of controller, it is an exercise in frustration.
2) OK so you go out and buy a $60 shield controller. Now what? You are going to buy a $40 stand or use a book to hold the tablet on the table? Talk about awkward gaming because most tables for humans are designed to eat off which means you'll be looking downward at a 30-45* angle at the screen instead of it being in front of you like a TV or PC screen. Awkward gaming with sore neck.
3) Now you paid $300+$60+$40 and realize you have a horrible game library of crappy Android games and you are playing them on a tiny 8 inch screen. Even playing traditional tablet touch style pretty games such as Rayman Legends is boring as heck after 20 min.
As I said, if one wants a gaming device they can carry around, you get 3DS/Vita. If you need portable gaming at home, you get Wii U.
Everyone else who quickly realizes that serious gaming on a tablet is awkward will suddenly view this as a working tablet. And here it instantly runs into competition with the Kindle, iPads and Samsung Tabs.
For about 2 hours you salivate that you have the worlds most powerful gaming tablet and then you realize the screens on the Samsung and iPads blow it away in real estate size and resolution. This product will sell to 5% or less and that's about it. If you read comments on other sites, besides hardcore NV users, no one cares about this thing.
In reality even PC streaming is compromised:
"NVIDIA did note that only 720p is supported through WiFi, and an Ethernet connection is necessary to stream at 1080p due to latency reasons"