Note : I know this post could be seen as Off-topic, but i dont think the idea of Stage 4 need any more posts...no one is able to explain why a Stage 4 is needed or what will be its purpose so this topic doesnt have any point.
I don't get the fascination with Starcraft. It wasn't even that good of a game. It was just Warcraft with stacking and another race.
Why not AvP instead? At least pick a game of the right genre :-) Imagine the predator wiping out the alien base as they are wiping out the human base as the humans are out hunting for the predator.
Because Starcraft was the first game to introduce 3 DIFFERENT YET BALANCED races. Many games managed to have 2 different races but balancing three is something few games managed to do. You couldn t play with the Zergs in the same way you played with the Protoss or the Humans. Zergs was about rushing endlessly with tons of cheaps units. Protoss was about making a strong base, and then come out with small squadrons of strongs units. Even Humans in the middle didn t play the same way Zergs and Protoss played : their units were too expensive to play like a Zerg yet not as efficient as the Protoss ones.
Warcraft 2 was good, very fun to play, but there was only 2 races, and there wasn t much difference between them.
Moreover, Starcraft had a great solo campaign with a great scenario in a new, well-thought and believable Universe (is there a Starcraft player that can forget Kerrigan ?).
Warcraft was set in a more common universe (heroic-fantasy game or yet another Elf+Human vs Orc battle) and the solo campaign wasn t very original.
About the "choose the right genre", AvP is all about the abilities of the players

It doesn t have buildings like Tremulous.
When you say "Protoss" everyone knows you re talking about tough warriors, but also great base defense. When you say "Zerg" everyone knows you re talking about shitty but cheap unit, with not-so-good base.