Do/Did fans of other teams ask if they're worried that Winston, Mariotta, Luck, Eli, Wentz, Stafford, Ryan, Tannehill, Wilson, Roethlisberger, Cam, Dalton, Bortles, et. al, would wear out?
Dak is not a fragile man. And he's young. Why would we be worried that he's going to be worn out?
As for Zeke, the same question could be asked. Are fans worried that Gurley might wear out? Adrian Peterson his first year?
I wouldn't worry about it. They're young, and their bodies are conditioned to play football. And they want to play all the time.