McCarthy can as well. And even if he doesn't, Because he's 62 next season, there's a greater chance he retires in 4 years anyway. Also note, there's NO chance he's in New Orleans for 15 plus years.
I'm sure that was the thinking when Denver TRADED for Payton, that there's no way he'll be here for the next 15 yrs. If McCarthy does want he did in Dallas go 12-5 in his 2nd yr he's not looking at retirement anytime soon