It is believed that the distortion of the panel is due to the fact that the screen is not full RGB and the panel is approaching colors, using better profiles in pitool and improving either the firmware of the panel and the firmware of the scaler.
With all this it could be possible to find a way that the color approximations are not so bad or random, the engineers must study in depth how the panel works and how the scaler works, and see what type of mask they put in to improve the approximation of the screen.
On the other hand it may be that the scaler does not have any problem, the problem is the panel that approximates colors and you lose clarity, you should try to improve the firmware of the panel talking to the manufacturer.
But it is quite possible that the 8k will improve in clarity considerably, maybe the clarity of the 5k + will not come but it is possible that the difference is almost imperceptible except in specific moments like horizontal vertical lines that will always be clearer in 5k + and all the obliques will be much clearer in the 8k.
Of course all this is an assumption that the panel company, the scaler and the pimax engineers want to collaborate.