Constraining the game too much? (Score 1)

I believe the concept for Spore is excellent, however I am worried that by shoehorning it too much into the traditional confines of a 'game' that it will lose it's fun. The sandbox gameplay with interesting emergent behaviors from your evolved creatures is enough for me, I wouldn't need arbitrary traditional goals to enjoy myself in Spore. Lets hope it isn't dumbed down too much for 'The Sims' players.