I think the worst that can happen is that someone reads the books and nitpicks through them, pulling out every trope they can find, including unflattering ones.

However if that happened, I'd say those authors should - if they saw the TV Tropes pages - take it as a critical analysis and see what tropes they are inclined to use and decide whether they want to use those tropes again (remember, there's even a page titled "Tropes Are Not Bad" and one titled "Tropes Are Tools").