Our current thinking is that at some point - we will give plenty of warning - we need to add new worlds that support the latest features in development. (For example, we can’t enable resource and world re-generation on the current worlds.) When we add these worlds, we’ll likely need to take some of the current worlds offline. However this doesn’t mean they’ll be deleted. They’ll just be offline. If there is sufficient interest I have considered allowing players to download these worlds and play with them locally (once the server + modding stuff is released.)