That would be ideal, but it's not the interest of the manufactures COO's and finance. But pushing the "trend" or "gimmick" helps the engineers make an excuse for need of developing other parts of the camera.
i know many of the members on these sites are enthusiasts or semi-pros, artists and that's a wonderful thing when you are allowed all those logical choices in camera and lenses creatively.
in the commercial world, the client says "i wanna shoot on a red", "i want it in epic 5k so we can crop both V and H for 1080p", "let's shoot on a phantom".
We've lost bids on jobs that we would have been able to complete with a "lesser" (for lack of a better word) camera equipment because they were so married to "4k", "RED", "phantom".
And being well equipped as possible leaves less room for both US and the CLIENT to make excuses on their decisions.
Remember you can always have 4K available but decide to shoot in 2k is you want.
For web only videos and internet ads, many times we're still asked to deliver H264's in 720p.
4K is resolution, and clarity but at the same time it is a catalyst for innovation.