I think most people are missing the point here.
The argument isn't whether Bing or Search (as a feature) is useless - I'm sure most people will agree that Bing, with its integrated QR scanner, music search et al is quite useful.
The question is if Search is such a primary requirement that it merits its own hardware key, one that gives it instant access regardless of whichever application you're in or whatever you're doing at the moment, especially since it is not contextual.
I really cannot imagine a scenario where a user would need instant search access when say, playing a game.
In this context, the Search hardware key is, to me, pretty redundant
To be relevant, the minimum it needs is:
1. Contextual search
2. The ability to disable it when inside a game