I think these 2 categories will be the most popular in MFS2020. I can't wait and hope more 3rd party devs and hopefully brand new 3rd party devs will join in to make awesome City and Landmarks add-ons. I think these will be extremely popular and sell very well, since the foundation or base sim has a solid framework to build upon.
Would love to see downtown Hong Kong with all the modern buildings, and other cities from around the world as well.