I believe the Bourne films were the catalyst for instigating a Bond 're-invention'.
The well received 'reality' based action scenes in those films simply rendered the outdated Bond movies redundant.
Casino Royale was a success because of it's literate screenplay, Bourne-esque action sequences and Craig's acclaimed performance (after some harsh criticism of his initial casting). It was hailed as a worthy departure from the Bond formula. However, QOS did not enjoy that 'element of surprise' to which Casino Royale benefited. It was simply a muddled mess of a movie.
Perhaps the Bond producers didn't want to change in the first place but were compelled to do so and felt quite happy to continue on with the bienniel offering of the established formula with the 'cartoon' spy character with his gadgets, blatant product placement and cheesy double entendre's
For realistic spy movies we can include Tinker, Tailor as the standard bearer.
Now we'll have to wait and see what Skyfall will bring.
Bond is such a fantastic character but given his iconic status, there has never been much 'experimentation' if you will. Casino Royale seemed so fresh because it explored the characters origins. QOS was so dull because the character was established and was simply a bulked up, unsmiling, taciturn man on a mission. The movie could have benefited from a little experimentation. For example, have we ever seen Bond have an internal monologue? It could have been an excellent detective story of how Bond, seeking revenge and validation for Vesper's death, longed to uncover the outfit behind her killing. The internal monologues could have been describing the conflict between his hurt feelings say and the need to maintain the composed and cold exterior.
But in QOS we simply see the cold exterior and it doesn't work.
Let's hope they play around with the character more and is not simply a well dressed bouncer again.