The problem with 4k is how games are made. The next gen consoles by todays standards could have enough power to run games in 4k@60fps. But the problem is is that games ten will be using way more resources than games today. Better physics, better ai, better textures, better effects....etc. Those all have a way of bringing everything right back down again.
This is why I believe that sony/ms/nintendo will go around 4k in a very different way. They would find a way to cheat. Have devs render their games at 1080p native but output at 4k







