When it comes to Deighton and Le Carre, don't forget how cynical and dark Bond is in the books. Palmer could certainly be transmogrified by Hollywood in the same way dear 007 was.
Bond is dark, even brutal at times in the books, but IMO he is not particularly cynical. In the early books he retains Bulldog Drummond's unthinking assumption that Britain is always in the right and he believes his actions are morally justified as "rough justice". The only time he shows any lack of righteous conviction is in
Casino Royale while recuperating from his beating by Le Chifre. He is talked out of his half-hearted doubts in a couple of pages by Rene Mathis.
In the later books, SPECTRE is unambiguously evil and purely criminal with not even SMERSH's partial excuses of ideology and national security.
In contrast, Le Carre shows both sides in the Cold War to be morally equal. Both sides do evil things for questionable reasons and the only real aim is survival. His heroes tend to be betrayed by their own masters, something that Fleming would never have written IMO.
Similarly, Len Deighton's heroes often seem to be more involved in turf wars with the USA or other departments than in fighting the Russians. Deighton's heroes display a level of insubordination that Bond never comes anywhere near in his relationship with M, who he treats more like a father than anything else.
Of course both Le Carre and Deighton to some extent wrote in reaction to Fleming. Le Carre explicitely and Deighton more because of society's changing attitudes and a need to distinguish his writing from the Fleming stereotype.
IMO it's entirely possible that Hollywood could create a "Bond" from Len Deighton's hero, look what they did with Matt Helm (actually, don't).