If we don't have two competent nose guards, I am not sure we should be in a 3-4. To play a 3-4 scheme effectively you need a dominate nose guard to eat up multiple blockers. This really concerns me right now.
I am a fan of the 3-4 scheme but if we do not have the NG then we need to be in a true 4-3. The question is, will we adapt?