I like the idea but the devil is very much in the details here. Any lmp1 class needs to be faster than lmp2 which means lots of downforce. Downforce means adding wings. This means the look of the cars is going to be very different from their road going versions. Adding more downforce means adding bigger wings which will change the looks a lot. But the main issue is the ground effects. All hypercars have some kind of tunnels on their undersides. Hard to balance that. Some even have active ground effects with moving wings. Hard to balance those even though I'd like to see them. At least on the upper side of the car so people can see them working.
Second one is how is the fia going to control the engines. Things like tires are pretty straightforward. But if most hypercars can exceed 1000hp when all the gadgets are spinning... and if you allow tuning it is pretty easy to get more horsepower out of the 800hp engines. How do you balance that (fuel, hybrid deployment)? Other issue with high horsepower numbers is the big topspeed numbers. One of the reason the current lmps can make those big numbers is because it is all hybrids. Hold the button at corner exit and use it for acceleration, the putter around the straightway on your coal and then coast into corners to recharge the gizmos. On straightways the cars are pretty slow. But if you have 1000bhp petrol turbo engines then the top speeds can go near 400kmh because it is going to be 1000bhp all the time. When you have gtes going around 270kmh the speed difference is going to kill someone.
All the while making sure the costs don't escalate. I hope it doesn't turn into spec class.
I like the idea that in best possible scenario you have wide variety of cars. Some front engine rear wheel drive, some mid engine cars, some turbo petrol, some hybrids, some awd. I hope the cars don't get the same aero packages and engines. I'd like to hear the v12 shriek of the ferrari against the turbobanger porsches and v12 vulcans and V8 ageras.
I hope there is no fuel limit, no power train standardization (can run without hybrid) and no spec aero parts. If that means having a balance of performance then I'd rather take that than over regulate the cars into being almost the same thing with just different body shells.