We would get low ball offers for both coming off injuries, as I have said in other threads, Carson worries me because of a possible degenerative situation and arthritis in a hip injury, Bo Jackson comes to mind. Since we don't know the details. Penny may get repaired but he will be a whole other season away from having his confidence and trust in the knee, he is not habitually the work out warrior Carson is also. The burst and ability to accelerate will take time to rebuild in that knee also.
We are going to need another RB that is a bruiser, Homer has shown he is a great third sown and change of pace guy, but doubts about the future of Carson and Penny almost forces us to address the situation in my mind.