Pilots in general are very conservative and when something works why change it.
And a radical change of display is extremely difficult to implement.
I have been flying with the Chelton/ Sierra System for some time.
It is a highway in the sky, synthetic vision, track vector PFD ; and the way the information is given is far better than all what we use now.
And it makes fun hand flying through the boxes and waypoint rings. Specifically the visual approach as a continues turn towards the runway.
Or you fly the aircraft in a slow flight with power and high nose up pitch and the vector shows it is going down..
On the market since 5 years or longer when taken the experimental aircraft into account.
No real success! Nearly nobody wants it and none of the large manufacturers copies it.
(Besides the Synthetic vision maybe)
A change might come with the symbolic that more HUD will bring.
Or we have to wait that the MS flight Sim generation becoming pilots.
Keep up the good work and look for new ways to design aircraft and avionics, only do not expect that they take off.
I think I have to correct myself, they will take off in UAV’s but the pilot stays on the ground.