I can see it happening, it's clearly working for Microsoft and Sony can see that. Although I kind of like the current model of basic free account that can play online and paid PSN+ member that gets discounts and frills. One of the reasons I stuck with PS3 was because of free online.
Platinums: Red Dead Redemption, Killzone 2, LittleBigPlanet, Terminator Salvation, Uncharted 1, inFamous Second Son, Rocket League