Fear not, people. RB workload is a positive. Heavy workload correlates with durability.
Heavy workload in college is a GOOD THING. Workload correlates with durability and nothing else. An actual study demonstrating this:
Also, just do a quick google search. RBs with more than 900+ carries in college are more likely to have longer careers and miss less time for injury than the average RB by a significant margin (over 4 years longer on average and more than 2 less games missed per year).