It's an interesting read for anyone who is curious about the history or future of the English language, or for anyone who wants a better understanding of how languages evolve. The author proves herself to be extremely knowledgable.
However, the book ends on a sore note with the far-fetched predictions in the final chapter on how the English language might change. Sure it will change substantially, but the author is dreaming up some pretty wild guesses here. She forgets to take into account that English language users have a discriminating ear for the language. Yes, something that sounds awkward in the beginning can sound natural in no time, but particles and grammar that sound outright alien will never get their foot in the door, so speak. They will be immediately rejected by English speakers and never catch on. And even if native English speakers are outnumbered by nonnative English speakers around the world, it's still the native speakers who will hold more influence as gatekeepers of the language in their roles as writers, media makers, editors, teachers, creators and compilers of style guides and reference books, etc.
I think the author also failed to consider how modern mass media can work as a force that preserves the language. I was waiting for a chapter on that, but it never came. Throughout the ages, when most changes in the English took place, 99.99% all utterances occurred face to face. No sooner was a sentence spoken than it was erased from existence.
Today books, internet, movies, television, music, and other printed and recorded media model the language for us in ways that will snap us back when our tongues start to stray from these norms. That is not to say that mass media will prevent English from evolving. We know that its far-reaching effects can be a catalyst for new expressions or ways of speaking. But what role does an interconnected planetary media play in conserving the language? Surely the question deserves an exploration in this book.
Despite this book's flaws, its still a worthwhile read for language lovers.