I can't say I agree on either game. The Sims and Animal Crossing share the same hooks, or lack thereof. In both games you make your own goals, or not, as you wish. Pay off your mortgage and build up a better pad. Or not. Gather a bunch of fossils. Or not. Becoming a fishing king. Or not. I don't even agree that The Sims ever pushed you to succeed. If it did, my friends and I certainly failed to receive the message. And judging by the tales on the internet, plenty of other folks did too!
I also disagree about the Nintendogs game. Or at least I don't think you're understanding what I'm getting at. Nintendogs was far more fleshed out than Tamagochis, sure. But Tamagochi was pretty conclusive evidence that the idea was sound. Think of it as a proof-of-concept for Nintendogs. If any executive was presented with Nintendogs and responded "virtual pets? It'll never sell!" they should probably be fired.