pc figures have 4k gamers at only about 1-2% of the market. I think only about 5% of people even have a 4k tv.
I think what we having now with the new consoles is 4k been used for marketing, it will mostly just be actually used for things like netflix, and low demanding games.
So no I dont think there is a need for a console specifically for 4k gaming, but remember these are also media centers. The neo if developers support it properly should give you enhanced visuals tho even if the same resolution.