I don't know - the Cities series is taking the next steps on what a city building sim should have progressed as. The last SimCity game was an afront to the series and should never have been released in that state. I say this as someone who's early commandline experience was typing sc2000.exe from dos.

I have hope that there is an online massive Sim world where Sims and SimCity players can co-play and create some amazing real-world scenarios.

I agree that SimCity 4 was the peak of the series but there are many hardcore simcity players that claim 3000 was peak SimCity. Just look at Magnasanti city for some proof of the dedication.