They've got to get the SLR selling better and keep it selling for a few more years and a roadster will do the trick along with the revised (sportier) coupe model, likely to be called the Track Sport. The roadster is going to be stunning.
The little car that Roberto posted at the start of this thread is what I think the next Smart should have been:
For a city runabout this thing is a cute as a speckled puppy. Imagine a car that looks like that, inexpensive, built to Mercedes standards with go-kart handling? It would be a hit all over the world in crowded urban areas.
M