Is Anyone a little bit worried about our secondary?

I love HB and P2 as much as anyone, but: A) Last time Mathieu tore his ACL, he played sub par the next season, B) We lack depth vs. good WR2s, C) We have seen the effects of a lacking secondary (NFCC) I'm just worried about our Cards. Help reassure me!

EDIT: Thanks for the Reassuring, reminded how important Pass Rush is and that HB tore more before. (Poet)