My Pops is on the Fire Dicky J Train, and we got to talking about this after the SF game. We actually came to realize we could put together a half-decent 3-4 with the team we have right now. Just for shts and giggles, here's how I'd envision it shaking out:
RDE: Spencer Johnson
NT: Marcus Stroud
LDE: Kyle Williams
ROLB: Aaron Schobel
ILB: Kawika Mitchell
ILB: Paul Posluszny
LOLB: Need to add a player
And the secondary we know.
As for that open OLB spot, the best we could do with the team we have (assuming Crowell is a goner) would be to start DiGorgio in the middle instead of Kawika, and put Kawika on the outside. Another intriguing possibility would be to keep the middle as is, and use Bryan Scott as an OLB. He's been playing in the box quite a bit, and we've been blitzing him a lot. Really though, we'd need to find a fast, athletic pass rusher, as Schobel alone just doesn't cut it, regardless of the system.
But I do think Schobel would make a damn good 3-4 blitzing linebacker, in that Jason Taylor mold. I believe he was playing down around 260 lbs. this year.