Seems like a decent idea, it's just a bit early in the Xbox One's life cycle for it to really work well. EA will be reluctant to add games that they still expect to sell in reasonable numbers. Games With Gold has a similar problem - we're only getting commercial flops for the Xbox One at the moment. I expect that'll change this year as launch games like Ryse and Forza 5 slowly get forgotten about.
Once the Xbox One has been going for a while it should get better. The Xbox 360 has a massive catalogue of forgotten games, many of them no longer available at retail. A subscription service would be a great way to monetise such a back catalogue.