Most games don't have that sort of licensed content to start with, so comparing to the total population of games isn't meaningful.

Offering a perpetual license would limit the licensor's options (e.g. they could never offer someone else an exclusive license, nor could they adjust the rates if the brand becomes more popular, nor could they terminate if the developer/publisher becomes toxic), so I guess while it's theoretically possible I just don't see why they'd want to offer such a license.

It is meaningful if the claim that perpetual licenses don't exist. They do. The terminology is often mocked, but comes in handy in case like this: "in perpetuity, throughout the universe".