I understand your frustration OP, but lets be honest. A year old port of a game when the true sequal Dead Space 2 is probably coming out around the same time would cannibalize its sales.
Want to compare on rails games from HD to Wii....compare Time Crisis sales to Dead Space sales.
Or maybe we will see Wii and HD simaltaneous releases of future rail games, in which case we will have to wait and see, but id bet it would comfortably be a nice 2:1 sale PS3 vs Wii.