Although I think DiNucci needs time to develop and fans are being a little harsh on him because of his one start last year, his performance in this game doesn't give Dallas any reason to keep him. Hopefully, he'll show better as the preseason progresses.
I think he's only a practice squad player at best at the moment, and that's only if the Cowboys are seeing enough glimpses in camp to try to develop him.
Fans have a tendency to overreact, but he just hasn't had any moment where you go, "See? That's what he's capable of."