There's a few flaws in your thinking, though.
First of all, by cancelling the game, you're punishing a huge number of people for something that 24 people did. That doesn't make sense at all. Secondly, the thing that these people did wrong, IMO, wasn't really that major. It was stupid, it was childish, but it's not like anyone's gonna die over it. The only thing this will do is generate a huge amount of sales of Link. His numbers are going to shoot through the roof.
Secondly, you seem to be taking offense "as a writer", against Ubisoft. Well, at least from the basic synopsis the article gave, the claims seem to be very dubious. You can't copywrite a theme, or even a group of themes. And you shouldn't be able to. Countless books utilize the same ideas and themes all the time, even the same mechanics. For instance, what sci-fi book these days doesn't have religious themes? The entire genre revolves around humans becoming godlike in some form and questioning their place in the universe. Also, the vast bulk of the work done for any book is in writing the prose. From my understanding, the prose of Link and AC have nothing to do with each other. So what about the Ubisoft writers who spent countless hours researching, pondering over, and penning the scripts? And IMO, the scripts in the series are all pretty solid. They're able to tackle big ideas without feeling horribly cheesy and cliche, and have quite a bit of fun. The Ubi writers deserve some credit for that.
Now, had whole chunks of the script been taken, verbatim, from Link, then the author would have a case. Had the term "Animus" been ripped from the book, then the author mght be entitled to a bit of compensation over the word.