Should next gen systems be fully Backwards Compatible from Day 1 to encourage people to upgrade?

[Pemalite]

Loneken said:
First : Child of eden can be played withouth Kinect and Ryse just use Xbox controller.

I know a lot of people only play the best looking new games, but i always enjoy gameplay first so, BC is very important to me.
If Scarlett is BC with original xbox, xbox 360 and xbox one, i going to buy day 1.
I have more than 250 digital games for the 3 Xboxes, so is very important to me the BC in Scarlett.
If the xbox BC team can add other systems (Dreamcast, turbograf,etc) this will be great.

Sorry for my bad english.

Just so we are clear... Scarlett will be backwards compatible with the entire Xbox One software library.

But it will only be backwards compatible with 27.34% of the XBox 360 library and 3.91% of the Original Xbox library... As Microsoft statements were pretty black and white on this matter, that all Xbox One software (Including current Backwards Compatible titles) will be forwards compatible with Scarlett... And doesn't extend past that at this stage.
Microsoft has also stopped adding Original Xbox and Xbox 360 titles to their backwards compatibility scheme for the time being.

For Original Xbox backwards compatibility, the XBox 360 is probably going to be a better option than the Xbox One or Scarlett as it supports more titles. (Or an Original Xbox of course via component.)