Windows Phone 8.1 Buttons

Recetly there has been some talk about WP8 physical buttons (rumors of back button removal, suport of software buttons...), so I've been thinking about the subject and I have thought of this:

The current layout is the following:

  • Back: Tap to back/Hold to multitask
  • Windows: Tap to start/Hold to voice search
  • Search:Tap to bing/Hold to... nothing

So, do you think this layout would make more sense for WP8.1 :

  • Back: Tap to back/Hold to multitask
  • Windows: Tap to start/Hold to notification center
  • Search:Tap to bing/Hold to cortana