Introducing AI agents alongside humans on the Internet is like introducing cars alongside humans on physical streets. (1) Some spaces will be AI-only, like bots trading against each other, similar to dedicated highways for cars. (2) Some will be human-only, like proof-of-human social networks, similar to walkable communities offline. (3) And some will be a mix, like Claude Code, similar to city streets with human and machine mixed in close proximity. But the whole digital world will need to be rearchitected.