I've thought about this too.
I had this pretty well thought out at one point, but now I see there are pros and cons and would probably change my vote to keep it as is.
*IMO it would force players to construct points and develop all-court games. I think we'd see players with much more variety.
*I'm afraid it would turn the ATP into the WTA-like breakfests.
If Cons out weigh the Pros, I'd leave things as they are. But I'd sure like to see it in WTT so we have a better understanding of exactly how it plays out.