I feel that splitting Starcraft into a separate game for each respective race will mainly be unfair to new gamers who didn't play the first game but would like to get into it.  Some people can't truly find the one they like by just playing a quick and limited demo to determine which one they would like.  I think it's going to lock out a good amount of newer players simply because they won't know which game to get. 

It rewards the hardcore players because, yes, there will be added value for the veteran that knows he's a Zerg player but the new player won't have a clue.  Maybe a bundle should be offered at a lower price for users that want all three race campaigns?