Generally it would be great if shape accuracy increased - I hope we haven't already passed the peak of shape accuracy. But I think this is likely, with more and more people adopting CAD solutions in their patternmaking. The detail and nice-ness of cars is already superb, in my opinion. The only question is whether this will spread to a few manufacturers who are not leading in this fashion.
I think the biggest developements in both technology and driving style will be in digital.
Anyone can have fun bash and crashing digital, it is great. But, if you don't want so many de-slots, it takes discipline in ALL the drivers on the field, much the same as in real motor racing. So will we learn to be disciplined enough to have great and challenging digital races?
On the technological side, the ability to send cars signals, and cars already having on-board chips will make all sorts of stuff possible. Lights control, already on scx where you can turn ur lights on or off, maybe people will find less deslots if they can flash the car in front to tell them they are about to overtake; implimentation of break lights with no need for capacitors just requires some chip programing, and again may help for driving when u see the car in front start to brake.
Sprints idea of seperate brakes could again be implimented digitally, don't know if its worth doing tho.
A lot of fun and interesting stuff is already on its way in the form of Scalextric World thingy, and I dont particularly mean the internet racing, but the telemetry, racing against your own previous performance, and stuff like that. Have they already done everything possible with the forthcoming system, or will people think of even better things that can be done?
Apart from digital, model trains have real steam, when will gimmiky real exhaust smoke appear for slots?