It's easy to release a whole new car with all the parts completely different though not sure whether it will be faster.
However, we think if we were G4 racers or dealers, we would hate that. Personally, I don't like to drive out-of-date cars. I prefer to drive something that is still hot at the market. If there is a completely different new car released (for example G5), all the current G4 cars will become old cars immediately and the spare parts stock in shops will be dead stock.
We don't like that. Since the G4 is a good car with the best handling performance among all touring cars, why bother to make a completely different car? We prefer to add more better features on the G4 to make it better.
No matter you are driving a G4 C-class, E-class, Evo or soon coming G4S, it's still a G4 and you can easily upgrade the car with the lastest parts if you want. This is what we want to do.
We will keep going on making the G4 better. 3~5 years later, may be 10 years larter, G4 will still be there.
Wish all the best to you guys and Happy New Year!!