(This thread partially links in to my other thread, see here.) In the Sims 3, they had a feature on the store where you could just buy an entire new world and what you got was basically just a world ...
Imagine if they released a new world (sims 4 style) based on the old games for the anniversary ? A Plesantview from Sims 2, Neighborhood 1 from Sims 1, Sunset Valley etc