Now this is an interesting take...it would satisfy both CC and EJ's desires/skill sets to play the middle AND get DT's speed on the field...the other spot could be a FA pickup (does that ring a "Bell", anyone?). I also agree that the DL would be improved and it would allow our OLBs to blitz more (Newman, et al). Add a few players in FA and the Draft and we are good to go.
I could see a 3-4 defense next season. Claiborne wants to play Middle Linebacker, and Roanall Smith looked really good before getting injured AGAIN. I could see us moving Claiborne inside with Henderson and then using Thomas and Smith on the outside. We would obviously need to sign another couple of Linebackers for depth at the very least, but hopefully we'd get a starter and let Smith and Thomas battle it out for the remaining spot.
On the defensive line it would make some sense too. Williams, if he isn't the best, he is in the top-3 DTs in the league and with Udeze and Scott with Mixon and Johnsotne backing them up, it might work out well for our line. Not to Mention I believe Steve Martin did pretty well in a 3-4 so it might improve his game when he comes in to spell Williams.
This would also hopefully force our defense to be more agressive with blitzing and things. And our secondary is a lot better when we play agressive.
It really all depends on whether we can sign a top Free Agent LB or trade for one. If we don't, I'd be pretty iffy about going into the package, but if we do, I say go for it.