I agree that the ILBs are the biggest problem for our defense. Our starters on the defensive line and OLB positions are actually pretty solid now. Granted they're definitely not elite, but like I say - pretty solid. In a 3-4 scheme, it puts a lot of pressure on your ILBs, and if they're not good players it's going to be hard to run an effective defense. In contrast, the 4-3 scheme puts more pressure on your DEs.
I believe that we'll have to look to add a player at ILB at some point in the draft next year, and potentially one in free agency too.