It seems to me as soon as the team has a unit that performs they find a way to blow it up. When Jouron was here the D played well, but were on the field so long the got burned at the end of games, answer Gailey. Galiey switch the D and improve the O, the D suffered. Next Marrone. He replaced the O with his own ideas and fix the D. The O suffered answer, Rex while the O isn't perfect it is somewhat productive, but his change in scheme destroyed the D.
I know we all get fed up as fans and demand a chance, but if there was more vision from those in power there are several scenarios that could have seen a well rounded playoff team in the last 10 years.
Some thoughts:
Keep Jouron, force a real OC on him and get him players
Keep Gailey Force a real DC on him already had the D players.
Hire Schwartz as HC and require OC approval.
I don't think any would have been a hit, but it may have been the vision the team has been lacking over the last 10 years. I know the drought has been longer than that, but I believe that Donahue had a vision whether we liked it or not.