The Devils effectively are in the same position as the 1987-88 Devils were. As Sean Burke said (paraphrasing): "We were in it, but not REALLY in it. We had to win just about every game."
Devils might be able to give up three points absolute max, if they want to make it in. Only realistic berths are Metro3 (Flyers) and WC2 (Caps).
Quick math: if the Flyers go 4-4 over their final 8, Devils have to go 7-2 to tie them; due to more wins, the Devils win that tiebreaker. If the Caps go 5-5 over their final 10, the Devils have to go 7-1-1; same deal as the Flyers, all the Devils would have to do is tie them, and they would win the tiebreaker based on wins.
Of course, the Red Wings and Isles are currently in better position, but too much time to go to make too much out of that.
Basically, Devils need to go 7-1-1, maybe 7-2-0 at absolute worst.