The GT350 had its run but its not really a money maker for Ford now. They have more than recouped the R&D costs for the car and now with the GT500 out there is no incentive to run them concurrently. The GT500 is unobtainium at the moment so you if you ran both cars you would lose out on GT500 sales because the average guy would say "screw it, I will take a GT350" instead of waiting. I get their reasoning, its time has come and gone.
Now I am hoping with the return of the Mach 1 that we will see a decent performance car that lives true to the namesake. I am a little disappointed that they are using the new front end for it, I think that **** is hideous.