you have me blushing for the compliments to Rifles. Like you, I think that the re-hashes of stories like Waterloo with nothing new to say are the pits. We both try to do something different and I think both of us would wish to know that we could clear a certain bar (in terms of new material) before embarking on a new book.
There are other issues here too. I am interested, for example, in the need of each new generation to re-visit certain important epics and or the lives of its leading historical figures. I might like Longford's biography of Wellington a little more than you do (because I think it is very well written), but we can both agree that it is about time for a major re-appraisal of his life !
There will always be a greater public taste for the lives of major figures such as W or Napoleon himself and for the the epic campaigns such as Waterloo. In this sense, the economic imperatives have a distorting effect. These are stories that people want to read over and over, whereas that account of the 1807 River Plate campaign or the life of Gen Rowland Hill will always be minority fodder. The solution for this last type of ground-breaking work ought to be academia, but alas military history is so unfashionable in western democracies that there are very few tenured historians able to investigate the less commercial themes. Still, academia is your life rather than mine and I expect you will have some views on this !