I have been thinking about this boat quite a bit. I have met Brian a few times and he is very smart as demonstrated by the VX one. He got everything just about spot on with that boat and it is certainly one of the best boats I have tested.
Having tested and sailed all the modern skiff single handers, I think for the EVO to work it needs a few things.
First the non-trapezing dinghies are better to sail. They are more involving - you can reach and adjust the strings with pressure changes. When on trap you sort of just hang on and ride it out. Non-trapezing are better tactically as well and therefore more fun in the long run.
To get the leverage of the trapeze you can just have a bit of a wing to allow the helmsman to sit further out.
Give the boat a bit of freeboard so different hiking styles can be employed.
Make it light and easily handled. The RS Aero is a revelation on this front.
I would have a stayed rig. This would allow the boat to suit a large range of sailors as they could tune their mast bend to suit. It should also mean a lighter rig and prevent the Finn scenario where you have to spend a fortune to find the right mast.
And critically, it has to be value for money. The VX one nailed this, the RS Aero nailed this and as a result they have been very successful.
Oh and if it could have that amazing downhill feel and speed the VX One has that would be awesome.