This statement was made by Ubisoft's director of subscriptions, Phillipe Tremblay, who recently spoke to Gamesindustry.biz about the digital future and Ubisoft Plus specifically. Tremblay states that people eventually "got comfortable" with not owning their CD or DVD collections, and that a similar shift in attitude "needs to happen" in gamers.
Similar to what happened to Netflix, competing services will harm this process. Currently the most comparable to old Netflix is the Xbox Game Pass; which if companies like EA and Ubisoft pulled their games from; it would be way less prefered.
As the profits that come to these companies decrease, they'll be more tempted to focus more on their own subsctiption platforms. Game industry has this trick up its sleeve that some games can be played 1000s of hours, but even adding games of this nature; satisfying every player with a single subscription service is impossible.