This book will change your wife – trope?

Wife is certainly not a trope. A trope is the use of a word in a figurative sense, but here wife has its literal meaning.

Other rhetorical devices might apply to this word. For example, the sentence is a paraprosdokian, “a figure of speech in which the latter part of a sentence or phrase is surprising or unexpected in a way that causes the reader or listener to reframe or reinterpret the first part” (Wikipedia).

I'm not sure if this has been parodied enough to quite count as a snowclone, but that's probably still what I would call it.

The Snowclones Database

Wikipedia article on Snowclones