There are not that many cars that can't use them - probably only the X-Factory cars and the Atomic Carbon Car.
You can get Li-Po saddle pack cells, and they fit inside an X10, so if they fit in that they will fit in the other cars that run saddle packs.
As for the x-factory and atomic carbon cars, I would guess that those manufacturers are either working on a chassis that will accept Li-Po packs easily or will be able to engineer a solution. Because the Li-Po's are so much lighter than Ni-Mih I think that the weight distribution issue could be addressed with the minimum of fuss.
If the customer demands cars that will run li-po, and i am sure they will in a very short space of time, if they become "legal" then the car manufacturers will listen and they will release chassis/conversions to accept li-po. Either that or loose business.
Personally, I would love to see Li-Po's made legal in off-road. I love 'em!
