With Losi cars, the design is a running change. The basic idea stays with changes being mostly bolt-ons. The design is tweaked until there is really nothing else that can be done to maximize the design. A retool is then in order. For example... from the XX series to the XXX series. Associated, however, had the TC3 on the screen and the track as a prototype until the majority of the tweaks were accomplished. There were a few changes made to the car since its first shelf release, but in comparison to other companies, they are minimal. Most other designs are being changed to "pull off the corner like a TC3" or to "corner like a TC3". This makes the TC3 a benchmark, with others standing on the side taking lessons.
The largest change most racers make is the battery location, but since the inception of the car, electronics size and weight have made that necessary. This as a factory change, and retooling the molds for less flashing and better precision, would be the best changes to the TC3, IMO. There is some evidence that this is going on. With that said, and noting the cost of mold retooling, an all new design is unlikely. Associated wouldnt retool the molds with an all new car on the drawing board. It wouldnt be cost effective. As Ray stated, what else can really be done? Why totally change what works, or complicate such a simplistic, efficient, and competitive design?
A few things to simplify tuning, that arent really revolutionary, or large changes, would be vertical ballstuds front and rear for inner and outer camber links. The transmission cases molded with mounting points for plate carbon shock towers would be trick (i.e. Pro4), and factory aluminum suspension mounts that allow adjustment with shims for front and rear squat/dive/toe would be very durable, and nice to see Associated offer. A motor cam like B.M.I.'s design would be really appreciated. I personally prefer a tub chassis... on many occasion my electronics have been protected from a hack or two by that tub. But there is no denying a plate carbon chassis... that shiot is HOT!