This idea is quite visionary, imagining a city-building game that leans heavily on community-driven content creation. It strikes a balance between the complexity and flexibility of Cities Skylines 2 with an even more ambitious, open-source-like model. The potential for a game where almost every element is user-generated, from buildings to music, could indeed revolutionize how city-building games are played and developed. The globe-based map system and the diverse building editor concepts are particularly exciting, offering a level of depth and realism not seen in current titles, I've researched how to design a city so perhaps you gonna need with this idea?
The suggestion to use Unreal Engine 5 hints at aiming for high-quality visuals and performance. It would be interesting to see how such a game would manage quality control and user engagement over time. Do you think a strong community management system would be necessary to curate and highlight the best content?