They're struggling for a lot of the reasons that were pointed out before the season but one other reason is that having the best CB duo just simply isn't worth as much as it used to be. Teams use RB's, slot WR, TE more than ever. You can move the ball in the NFL even if the perimeter is taken away. Which is their big strength over all of their competition. It's just become less valuable.
Schedule isn't too bad going forward though. Although, I do think Indy is a little underrated right now. Getting healthy at the right time and Luck looks good, just been overshadowed by all these young bucks with an array of weapons at disposal.