Simon Schama I Love You
The only caveat I have is that the existence of a broadly communicative, publically engaged rhetoric of history is dependent upon the existence of a body of much more meticulous scholarship. Schama couldn't have written Citizens if there hadn't been a large historiography to write about, and the same goes for any of the successful public-sphere historians of recent years.
In that respect, we can't simply press a button and revert to being Macaulay. There are things to know that require specialized forms of inquiry and research, and historiographies that have depth and detail to them that require respectful treatment.
There is a value to the monograph, and we should not be too careful to throw the baby with the bathwater. One of the functions of academic research institutions should be to subsidize the work that does not and cannot seek a public audience,
But Schama and Ferguson and others are right that this is now what drives historical research and historical writing completely, that this is the standard by which the relative merit of historical knowledge is judged within the academy, by the smallness of its professionalized craft rather than the breadth of its communicative ambitions.
I do not accept that this is an inevitable consequence of graduate training, either. We could train historians to write well, to seek audiences outside the academy, to stretch their powers of persuasion. Richard Slotkin, for example, once imaginatively suggested that doctoral students in history should all be required to write one work of historical fiction. You could add on to that one op-ed essay, one article for a popular magazine on history, one radio interview with an NPR show about their research, and one scholarly journal article that aims to pick a historically informed fight in the public sphere. The training need not be purely gestural: it could be a literal, concretized pedagogy. But it would take recognizing that what Schama asks for is not an optional extra, but part and parcel of the basic ambitions of academic history.