It presents a different challenge, which some will relish, but so would buying a completely different game. I think there are still a lot of people, who while appreciating some of the improvements, feel like they've ended up with 'SimNeighbourhood' instead of 'SimCity'.
I for one love a bit of complexity, it's not just because expanding your city to meet a new challenge is easier than redesigning it to make the best of limited space, it's because at the end of the day I like to have a big sprawling metropolis that I can spend hours just exploring with the pause button pressed, building little backstories to the different neighbourhoods and thinking to myself 'I built that'... I miss that.