Let's say I start with a Personal account. I use it for a few weeks. In this time, you are saying there won't be a Personal folder, right? So in a few weeks I am added to a Team. The Teams and Personal folders appear. Does this mean all the file paths for files inside my Personal folder change to /Personal/<prior path>?
This isn't a problem. Just make it work the way shared folders already do. When I join a team, create a folder with the team's name in the Dropbox root, and optionally (or in case of conflicts) let me also choose the folder name.
