This is a textbook. No matter how much you adore animation, no matter how interesting the field is, Maureen Furniss's book reminds you that this is an over a hundred year consolidation of the history of the animation world. And it's an interesting world, you know.
And yet the question is: ought teachers to switch over to this new textbook, one that encompasses recent years and strides in the animation field? I would say no.
Furniss's book is huge, struggling to include decades of information, and yet in order to make the book a publishable size, she had to cut things out; a lot of things. I felt that, having prior knowledge of certain eras due to my class textbook, she was skipping over information—important information. And knowing that she was cutting out things in American animation made me wonder if she was cutting out things in other countries' history of animation that I just didn't notice, which made it hard for me to trust her textbook to give me all of the facts.
While I would recommend readers to use Furniss's textbook loosely and consult other sources as well, it's expensive, and for that kind of money I'd say go with the older books (like Cartoons: 100 Years of Cinema Animation) and consult more recent readings on the side.