To be able to run the 3-4 you need to have a monster at nose. Though there have been a lot of statements about VV being a stud, as of right now thats all they are. IMHO I doubt we switch to the 3-4 in the future. In college I played on a defense that ran the 3-4 my freshman year and the 4-3 my last 3 year. We switched to the 4-3 because of the fact we didn't have a true stud that was able to disrupt the oline and command double teams to free up the linebackers.
My main concern isn't whether we have the talent to run the the 4-3, its whether or not we have the depth.