Here's my only two hang ups about firing Woods (who clearly does deserve to be fired)...
1. Minus the inexplicable coverage busts, this is the exact defensive scheme Stefanski wants to run. Rarely blitz. Constantly sit in zone. Keep everything in front and force a team to execute 8, 10, 12 play drives every time to get points. If this wasn't what Stefanski wanted his defense to be, he wouldn't have hired Woods in the first place.
2, You're not replacing Woods with an unemployed coach and installing a whole new system on the fly. So you'd be replacing him with someone internal like Howard, Bloom or Tarver. And that person would be someone who has only been teaching these guys the same schemes and concepts that Woods and Stefanski want these defenders to execute anyway. So the firing would be largely ceremonial.
If you were going to make a move, it should have been done in the offseason. At this point it's probably too late for it to actually be meaningful.