Matt Hartley at Lockergnome reports of  an article (http://www.businessinsider.com/henry-blodget-survey-confirms-bing-will-bomb-2009-7) arguing if Bing is a serious threat to Google (full article at http://www.lockergnome.com/web/2009/07/14/can-bing-make-a-ding/#respond).

Also Ron Schenone at Lockergnome covers the point (full article at http://www.lockergnome.com/blade/2009/07/15/microsoft-bing-gains-respect-so-why-will-it-fail)

I think that Bing is not a so radical change from Google to represent a breakthrough and so bring people to a switch.

Positions are consolidated and, in my opinion, only a real breakthrough or dumping (means something as was done by Microsoft for IE) or niche players (like Wolphram) can get some market shares.

This post also at http://www.lockergnome.com/web/2009/07/14/can-bing-make-a-ding/#comment-151557 and at http://www.lockergnome.com/blade/2009/07/15/microsoft-bing-gains-respect-so-why-will-it-fail/#comment-186937