I like to check Sarracenia rhizomes by gradually cutting away the dead material (which is usually orangish brown and sludgy) from the tip (opposite of where the leaves are being produced), until I see live, white tissue inside. If the whole rhizome is brown, I'm afraid you have a goner.
On another note, it doesn't really matter how many watts you give Sarracenia, it still won't be happy unless it's in full sun (unless you own a 5,000W MH+HPS phototron! OK, that's exaggerating, but you get the idea).
Don't give up!