"There ought to be a book entitled, Our Friends the Bacteria."
—Ashley Montagu & Edward Darling, The Prevalence of Nonsense, 1967, p. 49.

"Someone ought to write a book that would present the truth about the spy business."
—John Stockwell, The Praetorian Guard, 1991, p. 43.

"It's a remarkable phenomenon, small town cafe life, that has never been studied fully.  Someone ought to write a book on just that."
—V. William Barnett, Sticks and Shovels, 2002, p. 37.

"Somebody should write a book on autograph etiquette."
—Mark McGwire, qtd. in The Associated Press, Home Run!, 1998, p. 88.

"There ought to be a book which, if read, might turn into food.  But if we are starving we will have eaten before reading it."
—Shuntaro Tanikawa, Giving People Poems, 2005, p. 7.

"Someone ought to write a book about the way the wives of presidents used to operate.  There has been a change.  The whole society has changed."
—George Garner Harvill, In Her Own Words, 1990, p. 108.

"There ought to be a book published on the subject, 'First Steps to Getting Even with your Servants.'"
—Leonard Merrick, The House of Lynch, 1919, p. 150.

"There ought to be a book on badeboop badebeep."
—Steven George Krantz, Mathematical Publishing, 2005, p. 98.

"Somebody really ought to write a book about the funny conversations of drunks."
—Robert Joseph Casey, The Black Hills and Their Incredible Characters, 1949, p. 42.

"Somebody ought to write the story of the Texas towns that have died or seen better days.  There is a pathos about these modern Palmyras which often struggled to resist their fate."
—Harry Yandell Benedict and John Avery Lomax, The Book of Texas, 1916, p. 243.

"Someone ought to write a book on the influence of 'the undiscoverable factor' upon the course of human events."
—William Bennett Munro, Personality in Politics, 1924, p. 113.

"There ought to be a book dealing with the kinds of questions that come from the unique and often magical perspective of children."
—E. B. Freedman, What Does Being Jewish Mean?, 2003, p. xviii.

"Someone should write a book on the 'marginalia' of Henry Harrisse, for ... he was especially zealous in filling the blank spaces of his books with manuscript memoranda of just what he thought of the author."
—Randolph Greenfield Adams, Three Americanists, 1939, p. 28.

Including his own books. Harrisse's personal copies of his own publications are filled with enough marginalia for second editions.  Just look at his personal copy of Notes on Columbus for instance.