I was afraid that switching to the 3-4 was a bad idea and, unfortunately, my fears are being born out.
You can win in the NFL with a 4-3 defense: it's the scheme that both of the last Superbowl teams use after all.
The 3-4 was only an advantage when it was a rarity; a 3-4 team could draft great players lower in the draft that 4-3 teams passed on and opposing offenses would struggle being unfamiliar with it.
As the 2010 Bills have amply demonstrated, the 3-4 isn't any better than the 4-3 when you run it with the same players and, because nearly half of the teams in the league are running it now, the Bills aren't going to receive any gifts on draft day.
The reason the Bills offense struggled isn't because they didn't practice against the 3-4 on a daily basis, it's because their play calling was predictable, their run blocking and pass protection were anemic and their quarterbacking was inconsistent.