I get what they're thinking, but this is a mistake.
It's a highly competitive market already for the AAA space. It's boom or bust for how much these costs, and they're already facing issues with how much they're spending on largely unsuccessful movies.
This is not the way to diversify your portfolio. If they were serious they should have bought an existing AAA studio.
Their IP aren't going to translate extremely easily to the video game space and the time it takes to develop a AAA game may not coincide with the popularity of a tv series either.
This is an example of the good idea fairy visiting an exec and whispering into their ear. They'll be out of this space after 1 or 2 releases.