I think it is possible that Apple will eventually release an Apple TV which uses a faster CPU like the iPad Pro's A9X CPU and video chip.
But, there may not be a huge demand for a more expensive Apple TV with a faster CPU and video chip, so it may take some time before Apple releases a settop box or console which is as fast as a PS4 or Xbox One.
A lot of people generally buy cheap settop boxes like the Roku, and Chromecast which cost under $50, so if the Apple TV cost many hundred dollars it won't have a lot of buyers.
But, there may not be a huge demand for a more expensive Apple TV with a faster CPU and video chip, so it may take some time before Apple releases a settop box or console which is as fast as a PS4 or Xbox One.
A lot of people generally buy cheap settop boxes like the Roku, and Chromecast which cost under $50, so if the Apple TV cost many hundred dollars it won't have a lot of buyers.