Because a revision would be more power efficient than the X1, not to mention nvidia doesn't appear to be terribly invested in the shield tv considering how bad their marketing team is at making people care about it.
Also, you're making the assumption that companies don't sign contracts for specialized SoCs that don't make it into other products.
Also, you're making the assumption that companies don't sign contracts for specialized SoCs that don't make it into other products.
