If demand is high enough they'll do it, they'll botch it, but they'll definitely cave at some point & make a port. Besides Wii's still selling out other systems, lets face it, it's financially sound & when it comes down to it's all about Money!
"Dead Rising: Chop till you Drop" is the name of the Wii port by the way
& it looks great. Pick up a copy of Nintendo Power there's several pg.s dedicated to the game!