Quote Originally Posted by AndyRAC View Post
It actually is; look at WEC and W2RC (Dakar)......

And for that reason the WRC won't do it; as they'll want just one solution, as is the status quo.
Well so far it was also very difficult to open the regulations as the teams/manufacturers would have wound up with a small turbocharged 4WD car, with as long a wheelbase as you can fit. Realistically no one would have chosen a N/A V6 for example.

The topic only got interesting very recently with different propulsion concepts on the minds of the people paying the bills. LMH/LMDh probably gave the manufacturers an idea but even there the manufacturers mostly went for turbochargees V6/V8 engines of roughly 3 to 4 litres displacement.