According to Phil Spencer, Microsoft will probably debut a streaming service that doesn’t require a console for some types of content in the next three years. A 2012 trial of such a service inside the company was too costly and never made it to the market, but Microsoft’s progress in Azure cloud services over the past few years is changing the economics and quality level.
Due to the fact that it’s taking place over an internet connection, problems with input lag can hinder the experience. Spencer mentioned that Azure cloud service have changed the quality level, but we don’t know just how much of an improvement they offer in that area. Having the ability to play certain games on another device aside from an Xbox One would be great way to make their experiences more mobile, if they can solve the potential lag issues.
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Source: [H]ardOCP – Microsoft Will Probably Debut a Game Streaming Service in the Next 3 Years