BAsically you are talking about improving Situational Awareness to the point of Battlefield Visualization, From TRADOC Pam 525-70:
https://134.11.61.26/CD8/Publications/TRADOC/TRADOC Pam/TRADOC Pam 525-70 19951001.pdf
Battlefield Visualization is the process whereby the commander develops a clear understanding of the current state of all forces and the environment, envisions a desired end state which represents mission accomplishment, and then subsequently visualizes the sequence of activity that moves the commander's force from its current state to the end state.
The US considers this to be primarily of use for Commanders and Brigade and higer, but the tenets can certainly be applied at the section level.
To be successful in battle, the commander must apply experience and intuition to sort through the myriad of information available on the battlefield. Determining critical information requires focus on three aspects of the commander's vision.
(1) The first is understanding the current state of friendly and enemy forces. This knowledge extends beyond the physical location of forces, environmental factors, and combat readiness (equipment and supplies). It also includes human factors such as fatigue, morale, and the decision-making processes and information requirements of both forces.
(2) The second aspect of the commander's vision is the ability to clearly discern a desired end state. Initially, this involves foreseeing a feasible outcome to the operation which results in mission success and leaves the unit postured for the next mission.
(3) The third aspect of visualization is the ability to see and understand the dynamic relationship between the opposing forces as the commander leads forces through the sequence of activity from current situation to final end state. This includes envisioning possible enemy moves and counters to those moves to defeat or destroy the enemy force. The commander decides when to shift the main effort, when to change priorities, when to reinforce, when to request additional forces, or when to disengage. During the execution
of the mission, the commander continually assesses the envisioned end state to ensure
that it is still desired and achievable.
If one were to apply the criteria above to your ideal HUD, then I would add in the location and movements of the enemy, as well as the section members. We have all been on attacks that have foundered with "locating the enemy", and on ones that have "lost track" of the enemy whilst making an approach or flanking manoeuvre. This is about fusing the different types of Situational Awareness, or SA. At the higher levels, Brown SA (georeferenced data) is critical - it would be less so at the section level. Blue SA is obviously critical - and is covered by your "glowing puck" analogy, showing location of own troops. Red SA would add in the enemy location, once identified (and the technological challenge of putting that into your HUD on the fly would be significant. Finally, some (Gen Nordick is a big proponent) have suggested that we need to consider White SA as well, which refers to non-combatant information - location of refugees and non-combatants, a big glowing X over the mosque etc.
With the combination of SAS (Situational Awareness Suite) and ATS (Athene Tactical System), we are very close to being able to fuse Brown, Blue and Red SA in a single display, with "icons" for each vehicle (and icons can obviously be grouped). The limitation on displaying individual soldier icons is quite frankly weight - I know that SAS has been deployed on individual soldiers recently, but the kit (think GPS and a radio, along with a display screen, all lashed to your body) is heavy and unwieldy.
Havind said that, I am sure that weights will come down. Once that is the case, it is simply a matter of having information processed higher, and transmitted (digital capacity of the tactical net is obvioulsy an issue) to the indicidual HUDs.
What you are proposing may not be all that far off - and will obviously have a significant impact on our TTPs.
I will throw in one last quote from the pam:
c. The successful future commander must possess an intuitive feel for combat developed through repetitive training, experience, and exposure to experienced mentoring and leadership. This intuition is based on a timely and accurate view of the battlefield if the unit is to be successful in battle.
This is about raising the bar when conducting section attacks while training - simply repeating the drill over and over again addresses none of the points listed above.