They don't come out with games of almost all different genres like an EA. EA had rpgs sports, racing, fighting, I mean countless genres compared to Activision call of duty or ubi soft assassin creed
Being different genres is meaningless. People would pay for a service for those companies releases.
People would pay for access to cod games alone.
Warner bros you got witcher 3,mortal kombat,lego games,shadow of mordor,dying light etc
Ubisoftt,far cry,watch dogs,asscreed,theyve got lots of indies etc
Every big studio could easily do it.