Best case scenario, only two teams are happy.
The team with the fastest car, and the team with the prettiest car. Every other car is slow and ugly, like a SsangYong.
Think of it this way:
Here's a Bentley, covered in bugs and grime from 24 hours of driving.
Now, you couldn't do that with one of the other 20 cars on the grid because:
A) it's nothing special if it didn't win, and
B) restaurants don't make money if people throw up everywhere because they can see the car.
Try convincing sponsors to get behind something that's ugly and slow will be difficult; the less people want to look at them, the less coverage they're going to get. Same reason nobody has races a silhouette Ssangyong.