They want to remake it for the same reason as everyone else: make more money. The series doesn't need it, and they are merely jumping on the GoW fad. To bring Square back into this discussion, it seems no developer can resist the urge of remaking games OVER AND OVER AND OVER AND OVER AND OVER AND OVER AND OVER *smacks self* If it weren't for gullible people shilling $20-$30 for "prettier games," developers might be forced to try something new. I don't need new versions of said games, because I don't find fault (or enough fault) to justify the expense. I'm being cynical, but that could be because Gamefly has rendered the "$60 investment" moot.
Go Gamefly.
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"Should I slice off your tongue or break your countless bones? Either way, I get paid; you'll bleed to death and die alone." - Blood Money