Publishers are going to start moving over to this exact model imo. I fully expect you will see at least a Ubi Access sometime over the course of the next 3-5 years imo.
Its incredibly smart, and EA Access has done incredibly well for EA. The thing is a lot of these older titles don't move significant copies anymore. As games move more and more into a microtransaction / Games as a Service basis, these sort of sub programs make a ton of sense.
For example Halo 5 in the Game Pass. That title doesn't push huge numbers anymore, but by adding it to the Pass MS opens up the door for a surge of new consumers who may find they enjoy Halo 5 and begin buying REQ packs, when maybe they never would have ended up buying Halo 5 at all in the first place.