Meh, nothing wrong with the scheme, all schemes can be attacked, the problem is they are talent deficient right now. When Zamula - Walker are your 2nd pair on defense . . . when you're playing two RWs out of position, when your best playmaker is a 22 year old rookie in his 6th game . .
Watching around the league, it's partially a perception issue. When you play a good team and have a lead, they'll take more chances to pen you in your own D-zone, so even if you're playing the same way you did the first two periods, it'll look like a shell - and if you have a bunch of young players who aren't used to NHL pressure, they'll make bad mistakes.