Hell no. If Cam's hurt and we don't have Anderson we are toast.
Anderson can at least make us competitive. I'm not sold on Webb. He's made some nice throws but we don't know that he can handle a whole game against starters. Also, trading Anderson makes Cam the most experienced QB on the roster. Although I think Cam is just about on his way to handling things on his own I think a vet like Anderson is still valuable to him as a mentor and teacher.
If Cam's hurt? We're hurt anyway. And at some point the student must become the teacher....., Trade for the highest value. Which in our case would be DA