They already stated that this should be able to cut the time it takes to jump into a game in half (or more)...
I hope everyone realizes that the video is a simulation and not a demonstration...
So they make a simulation... and arbitrarily decide to make it take as long as the Wii U currently takes to boot up, when they could 'simulate' faster load times?
Do you not remember the videos they made showing the faster load times before, when they were preparing to launch their major OS update? Two side by side consoles, loading into NSMB U? They absolutely are showing the exact load time of this, that's the point of the demonstration.
I think you're failing to understand something. The point of the feature is to start a game as soon as the OS loads. This means you don't have to wait for the OS to load normally, pick your user, then select the game from the OS once it has loaded up. This makes it faster, not "look like" it's faster. The load times may be the same, but since you're navigating less it cuts down on time by more than you think.
You just spelled out exactly what YOU don't understand.
Normally, the system boots up, you choose your Mii, your game icons appear, and the system goes into the game.
With this, your game icons appear, you choose your mii, the system boots up, and then goes into the game.
The only difference is the order of events. The time needed for each of them to occur is exactly the same.