(I know that he has had ghostwriters for the last x books but the characters and stories are now finite)
A real "Tom Clancy" style book would be take an exciting game of, say, Steel Wolves or Hornet Commander and remove all the dice rolling and turn it into fan fiction by adding a little imagination to the characters and tons of background for people outside .mil and outside the wargaming hobby.
Unfortunately what we'll get is a ghostwriter who will probably steal the plot of an ancient WWII era submarine movie and make it Clancy-style by adding a dude who wants to defect to visit Montana and the main character would be named Ryan and the tech details and "wargaming" would be completely butchered into laugh ability by anyone actually in the .mil or into wargaming.