We need a lot of new personnel if we are to make a successful switch to the 3-4. If we acquire all these required personnel via FA , trades or draft, that leaves precious little resources for OL and QB. Where do we get them ? A good off-season will net 3-4 solid players who can start and contribute this season. These players should be split between the O and D.
I think we should plug the holes we have in the D (LB primarily) and shore up our offense. That will make sure we have two half way competent squads to field. Going to the 3-4 will almost ensure we will suck on O once more or make a half hearted effort at the 3-4 leaving both squads slightly incompetent