I understand what your saying Paul but you cannot seriously expect to half the weight of the heaviest component and expect the car to handle the same without any set-up changes and/or car changes.
In touring cars they have lost a cell (70g) and the cars are going as quick, with less wear and improved handling.
In off-road 5 cells can be as quick if not quicker than 6 cells in 2wd.
By using Lipo we can reduce the minimum weight, reduce wear and tear, possibly even tyre wear.
Isn't light right?
My personal thoughts on Lipo for 2008 are that it won't happen, we currently have no rules for them. We had brushless rules 1 or 2 years before they became mainstream, and yet another year before thy came legal.