Is it really effective to put guys who arent playing well on the 3rd or 4th line?

Yes its caps specific but it works out. Ok so backstrom only had a couple of ists so bruce put him back on the 3rd line to spark him and now he's on fire (last game 5 points) but now chris clark and nylander are both struggling. They have both been sat and now i checked today and it looks like nylander and clark will be on line 4 with brashear does this kind of thing really work, is it even worth it? Im sure neither of them are happy down there